- 173 - Pacific War Podcast - Fall of Mandalay - March 11 - 18 - , 1945

Last time we spoke about the Great Tokyo Air Raid. Amidst fierce battles, Liversedge's forces captured key hills but faced relentless Japanese machine-gun fire. Despite heavy casualties, the Marines advanced, securing strategic positions. General Kuribayashi recognized their struggle, while the Japanese counterattacks faltered. After 19 grueling days, the last pockets of resistance fell, marking a costly victory for the Americans. Amid the fierce battle of Iwo Jima, General LeMay shifted tactics, launching incendiary raids on Tokyo. On March 9, 1945, 334 B-29s unleashed destruction, igniting widespread fires and devastating neighborhoods. The attack shattered Japanese morale, while LeMay's strategy proved effective, paving the way for further offensives in the Pacific. On March 3, three brigades attacked Meiktila, facing fierce resistance. Tanks overwhelmed Japanese forces, resulting in heavy casualties. As Cowan fortified defenses, Japanese counterattacks intensified. Meanwhile, in Mandalay, British-Indian troops advanced, capturing key positions. Amidst confusion and conflicting orders, the Allies pressed forward, striving for victory in Burma.

This episode is the Fall of Mandalay

Welcome to the Pacific War Podcast Week by Week, I am your dutiful host Craig Watson. But, before we start I want to also remind you this podcast is only made possible through the efforts of Kings and Generals over at Youtube. Perhaps you want to learn more about world war two? Kings and Generals have an assortment of episodes on world war two and much more  so go give them a look over on Youtube. So please subscribe to Kings and Generals over at Youtube and to continue helping us produce this content please check out www.patreon.com/kingsandgenerals. If you are still hungry for some more history related content, over on my channel, the Pacific War Channel you can find a few videos all the way from the Opium Wars of the 1800’s until the end of the Pacific War in 1945. 

We are first picking up this week with the men fighting over northern Luzon. By March 5, General Clarkson’s 33rd Division had advanced to Agoo and Pago while gradually pushing the enemy along Route 11. Meanwhile, Colonel Volckmann’s guerrilla force was carrying out limited offensives in the Laoag, Cervantes, and San Fernando regions. Coming into Salacsac Pass from the west, the Villa Verde Trail twists up the wooded western slopes of a steep-sided height known to the 32nd Division as Hill 502. Another peak, bare crested, forming part of the same hill mass and named Hill 503, centers 250 yards northeast of the crest of Hill 502, while a similar distance to the southeast is Hill 504. Winding along the southern slopes of Hills 502 and 504, the trail continues eastward through a low saddle about 500 yards long, climbing again up the forested northwestern side of Hill 505. After crossing that hill, the trail follows a twisting course 600 yards--as the crow flies--eastward, hugging the densely wooded northern slopes of Hills 506A and 506B. Off the northeast corner of Hill 506B the trail turns south for 1000 yards--again a straight-line distance--and traverses the east side of the noses of Hill 507, designated from north to south A, B, C and D. Turning sharply east again near Hill 507D, the trail continues east another 700 yards and then enters a deep wooded saddle between Hill 508 on the south and Hill 515 to the north. After passing through this saddle, which is about 250 yards long east to west, the trail goes on eastward, dominated on the north by Hills 516 and 525. Roughly 1250 yards beyond the saddle the trail twists across the northern slopes of Hill 526, which lying about 500 yards southeast of Hill 525, marks the eastern limits of the Salacsac Pass area. A mile and a quarter of less rugged but still forested and difficult terrain lies between Hill 526 and barrio Imugan, in turn two and a quarter miles west of Santa Fe. 

Meanwhile General Mullins’ 25th Division had successfully taken control of Puncan and Digdig. Due to this unexpectedly swift progress, General Swift instructed Mullins to continue advancing toward Putlan while the 1st Battalion, 127th Regiment fought for control of Hill 502, which was secured on March 7. In response, Mullins dispatched the 161st Regiment to attack the high ground west of Route 5, the 27th Regiment to advance along and east of the highway, and the 35th Regiment to execute a wide envelopment to the east. Since this last flank approach to Putlan was completely undefended, the 1st Battalion, 35th Regiment quickly occupied Putlan on March 8. The following day, the 27th Regiment also arrived in the area and began clearing Japanese stragglers from the ravines east of Route 5 near the barrio, a task that would not be finished until March 15. Finally, despite facing rough terrain and light resistance, the 161st Regiment reached Putlan on March 10, successfully securing the high ground to the west. To the north, as the 1st Battalion, 127th Regiment struggled to make significant progress eastward after capturing Hill 502, Gill decided to send the 3rd Battalion, 127th Regiment to outflank the Salacsac Pass defenses from the south. 

Although the extremely rough, precipitous mountain country of the Salacsac Pass area, averaging 4500 feet above sea level, was covered by dense rainforest, from Hill 506B to Hill 526, there was sufficient open ground throughout to provide the defender with excellent observation. It was not too difficult for the Japanese to find positions whence they could cover with fire every square foot of the Villa Verde Trail through the pass area. The twisting of the trail also provided defense opportunities, for in a given 1000 yards of straight-line distance through the pass, the trail might actually cover a ground distance of 3000 yards. Whatever its shortcomings in other fields, the Japanese Army always had a feel for terrain, exploiting to the full every advantage the ground offered. Thus, as it moved up, the 2nd Tank Division set to work to establish a system of mutually supporting defensive positions in order to control every twist of the Villa Verde Trail and every fold in the ground throughout the pass area. Every knoll and hillock on or near the trail was the site of at least one machine gun emplacement; every wooded draw providing a route for outflanking a position was zeroed in for artillery or mortars. The cave, natural or man-made, came to characterize the defenses. Artillery was employed in quantity and quality not often encountered in engagements against the Japanese, who, as usual, made excellent use of their light and medium mortars. Finally, the 2nd Tank Division was overstocked in automatic weapons, evidently having available many more than the 32nd Division could bring to bear.

To the west, following recent successes in patrols, Clarkson opted to establish a new "secure line" stretching from Aringay southeast through Pugo to Route 11 at Twin Peaks. Consequently, patrols quickly secured Aringay and Caba without facing any opposition, then advanced east along the trails to Pugo and Galiano, and north to Bauang, where they continued to encounter minimal enemy presence. As a result of these movements, the Hayashi Detachment was ultimately withdrawn to bolster the main defenses at Sablan, enabling Volckman’s 121st Regiment to enter San Fernando on March 14. Additionally, elements of the 19th Division began arriving in the Cervantes area from Baguio and successfully expelled the guerrilla company from the town in early March. The Filipinos recaptured Cervantes on March 13 but soon found themselves targeted by Japanese artillery positioned on elevated ground. Meanwhile, looking south, by March 5, General Patrick’s 6th Division had commenced unsuccessful assaults on Mounts Pacawagan and Mataba, while General Hoffman’s 2nd Cavalry Brigade struggled to advance toward the Antipolo area. Recognizing that the success of his attack required a concentration of forces along a narrower front, General Griswold decided to focus on the Noguchi Force and the left flank of the Kobayashi Force, as the northern area was heavily fortified. He retained only one battalion as an infantry reserve and directed the remainder of his available forces, all of which were understrength, to push eastward. Alongside the deployment of the 1st Cavalry Brigade, the 103rd Regiment reached Taytay on March 7 to serve as the 1st Cavalry Division Reserve, signaling the upcoming relief of the cavalrymen in preparation for their redeployment to southern Luzon.

By March 10, General Wing’s 43rd Division had been replaced in the Clark Field area by the 38th Division and was en route to the eastern front.  The 38th Division pushed on into the untracked, ill-explored, and worse-mapped wilderness of the central Zambales Range, its progress slowed more by supply problems than Japanese resistance. In early April the division noted that the last vestiges of any controlled defensive effort had disappeared. Unknown to 11th Corps General Tsukada, on April 6, had given up and had ordered his remaining forces to disperse and continue operations, if possible, as guerrillas. For the Japanese remnants, it was a case of sauve qui peut. Some tried to escape to Luzon's west coast, whence 38th Division troops were already patrolling inland; others tried to make their way north through the mountains, only to be cut down by American patrols working southward from Camp O'Donnell. The 38th Division had killed about 8000 of the scattering Japanese by the time it was relieved by units of the 6th Division on May 3. The losses of the 38th totaled approximately 100 men killed and 500 wounded. The 6th Division, elements of which remained in the Kembu area until June 25, limited its operations to patrolling and setting up trail blocks along Japanese routes of escape. Troops of the 38th Division ultimately returned to the region and remained there until the end of the war. Insofar as US forces were concerned, the mop-up period under 11th Corps control was even more costly than had been the 14th Corps' offensive period. From February 21 to the end of June the various elements of 11th Corps committed to action against the Kembu Group lost approximately 550 men killed and 2200 wounded. The Kembu Group, during the same period, lost 12500 killed or dead from starvation and disease. By the end of the war the original 30000 troops of the Kembu Group were reduced to approximately 1500 sorry survivors, about 1000 of them Army personnel. Another 500 had already been taken prisoner.

As a result, General Tsukada ordered his remaining troops to scatter and operate as guerrillas. Meanwhile, Griswold resumed his eastern offensive on March 8. In the south, bolstered by artillery and mortars, the battered 2nd Cavalry Brigade continued to advance slowly under heavy artillery fire, reaching a point 440 yards short of Antipolo along Route 60A and overcoming the enemy cave defenses at Benchmark 11. By March 11, patrols had entered Antipolo, discovering the town was devastated and deserted, yet still under the threat of Japanese artillery and mortars positioned in the hills to the north and northeast. Simultaneously, the 1st Cavalry Brigade made significant strides to the north, also coming within 440 yards of Antipolo while clearing Benchmark 9 Hill and Hills 520 and 740. Abandoning the Montalban-San Mateo area, Patrick instructed the 1st and 20th Regiments to advance toward Mounts Baytangan and Yabang. Facing unexpectedly light resistance, the 1st Regiment advanced a mile and a half east by March 11 and secured Benchmark 8 Hill to the south despite encountering stubborn opposition. Recognizing the need to capitalize on this success, Patrick then ordered the 20th Regiment to move through the 1st and attack north toward Wawa Dam while the latter continued its eastward assault.

On March 11, the 103rd Regiment took over from the 2nd Cavalry Brigade and quickly began planning to outflank General Noguchi’s defenses located southeast of Antipolo. However, due to concerns over American advances, General Yokoyama ordered the Noguchi Force to retreat to secondary defensive positions while preparing for a three-pronged counterattack set for March 12. The primary effort involved four reserve battalions from the Kobayashi Force, which launched an attack southward from Mount Mataba toward Marikina but were quickly halted by intense air and artillery fire, falling far short of their target. Additionally, the 182nd Independent Battalion attempted a counterattack toward Benchmark 8 but was unsuccessful, while the majority of the Kawashima Force advanced south from the Ipo Dam area to assault the rear installations of the 6th Division west of the Marikina River, where they were easily repelled by March 15.

During this so-called counterattack, Griswold continued his offensive, with the 103rd Regiment swiftly advancing through the deserted Antipolo to Benchmark 7 Hill, and the 20th Regiment moving over a mile north to secure a position on a grassy ridge less than a mile southeast of Mount Mataba's summit. On March 14, the 1st Regiment resumed its eastern assault, successfully advancing north to a bare peak about a mile southwest of Mount Baytangan, despite facing strong resistance that caused heavy casualties, including the loss of General Patrick, who was succeeded by Brigadier-General Charles Hurdis as commander of the 6th Division. Simultaneously, Wing initiated a coordinated offensive with two regiments toward Mounts Yabang, Caymayuman, and Tanauan, aiming to flank the Shimbu Group's left. Although the 103rd and 179th Regiments achieved significant progress that day, Noguchi’s determined defenders managed to maintain control of Benchmark 7.

Looking further south, Griswold was preparing to launch a two-pronged offensive in southern Luzon. General Swing’s 511th Parachute Regiment and the 187th Glider Regiment were set to advance towards Lipa from the north and northwest, while the 158th Regiment gathered near Nasugbu to attack southeast along Route 17 toward Balayan Bay. In response, Colonel Fujishige’s Fuji Force had established several small positions in the area to prevent American forces from flanking the Shimbu Group's main defenses by rounding the eastern shore of Laguna de Bay. Swing’s offensive commenced on March 7, with the 187th Glider Regiment descending the steep southern slopes of Tagaytay Ridge to the northern shore of Lake Taal, ultimately stopping at a hill two miles west of Tanauan due to strong resistance. The 511th Parachute Regiment moved out from Real, reaching within a mile of Santo Tomas while launching unsuccessful frontal assaults on Mount Bijiang. Meanwhile, the 158th Regiment advanced from Nasugbu, quickly securing Balayan before pushing eastward with little opposition toward Batangas, which fell on March 11. On its eastward path, the regiment bypassed significant elements of the 2nd Surface Raiding Base Force on the Calumpan Peninsula, necessitating that a battalion clear that area by March 16. At the same time, other units of the 158th Regiment encountered robust Japanese defenses blocking Route 417 at Mount Macolod, where their advance came to a halt. Concurrently, General Eichelberger continued his offensive against the central islands of the Visayan Passages, with reinforced companies from the 1st Battalion, 19th Regiment successfully landing on Romblon and Simara islands on March 11 and 12, respectively.

Most importantly for Eichelberger, he was about to initiate his Visayas Campaign. To disrupt Japanese communication lines across the South China Sea, the 8th Army needed to quickly capture airfields that would allow the Allied Air Forces to project land-based air power over the waters west of the Philippines more effectively than from Clark Field or Mindoro. Consequently, the first target chosen was Palawan, which was defended by only two reinforced companies from the 102nd Division. Additionally, MacArthur's strategy included the eventual reoccupation of the East Indies, starting with the capture of Japanese-controlled oil resources in northern Borneo as soon as land-based air support was available. The Zamboanga Peninsula and the Sulu Archipelago were identified as the second targets, although these areas were defended by stronger garrisons from the 54th and 55th Independent Mixed Brigades. Despite this, Eichelberger tasked Major-General Jens Doe’s 41st Division with executing these invasions. For the Palawan invasion, codenamed Operation Victor III, Brigadier-General Harold Haney was appointed to lead a force primarily composed of the 186th Regiment, which would be transported to the island by Admiral Fechteler’s Task Group 78.2. The convoy departed from Mindoro on February 26, escorted by Rear-Admiral Ralph Riggs’ cruisers and destroyers. Following a naval bombardment, Haney’s Palawan Force successfully landed at Puerto Princesa on February 28 without encountering any opposition. They quickly secured the town and the two airstrips to the east, advancing to the western and southern shores of the harbor by late afternoon to establish a defensive perimeter.

As the first day progressed, it became clear to the American troops that the Japanese troops would not put up a fight at Puerto Princesa and had withdrawn into the hills to the northwest. More disturbing was the revelation of a massacre of approximately 140 American prisoners of war the previous December. The presence of a passing Allied convoy made the alarmed Japanese believe that an invasion was imminent and had herded their prisoners into air-raid shelters, subsequently setting the shelters afire and shooting prisoners who tried to escape. Only 11 American prisoners of war miraculously survived immolation and escaped the shooting. Sheltered by natives until the Americans landed, they emerged during the battle to tell their horrifying tale, which only hardened American resolve to end Japanese rule over the island.

By March 1, the 186th Regiment had successfully taken control of Irahuan and Tagburos. In the following week, American forces would eliminate two or three heavily defended strongholds located ten miles north-northwest of Puerto Princesa, where the enemy garrison was ultimately defeated. The Palawan Force also conducted reconnaissance of several offshore islets, discovering no Japanese presence on some and swiftly clearing others. However, due to the poorly compacted soil, the new airfield on the island would not be operational until March 20, which was too late for any aircraft based in Palawan to assist with the Zamboanga landings. Consequently, on March 8, two reinforced companies from the 21st Regiment were flown to the airstrip at Dipolog, which had been secured by Colonel Hipolito Garma’s guerrilla 105th Division. On the same day, sixteen Marine Corsairs arrived to provide air support for the invasion of Zamboanga, codenamed Operation Victor IV. For this operation, Doe assigned the remainder of his division, which was to be transported by Rear-Admiral Forrest Royal’s Task Group 78.1. After three days of pre-assault bombardments and minesweeping, the convoy finally set sail southward and entered Basilan Strait from the west early on March 10. Troops from the 162nd Regiment landed almost without opposition around 09:15 near barrio San Mateo and quickly secured Wolfe Field, while the 163rd Regiment was also landing. Doe’s two regiments then began to advance inland, facing minimal resistance as they established a night perimeter. With the Japanese having withdrawn, the 162nd and 163rd Regiments easily secured Zamboanga City, San Roque Airfield, and the rest of the coastal plain by dusk on March 11, with one company extending further to Caldera Bay to the west.

To drive the Japanese forces from the elevated positions overlooking the airfield, Doe dispatched the 162nd Regiment towards Mount Capisan and the 163rd Regiment towards Mount Pulungbata. Additionally, the guerrilla 121st Regiment was tasked with blocking the east coast road in the Belong area. Supported by continuous artillery fire and close air support from Marine Corps planes, the two regiments of the 41st Division faced arduous tasks. General Hojo's troops held excellent defenses in depth across a front 5 miles wide, some portions of the line being 3 miles deep. All installations were protected by barbed wire; abandoned ground was thoroughly booby-trapped; mine fields, some of them of the remote-control type, abounded; and at least initially the 54th Independent Mixed Brigade had an ample supply of automatic weapons and mortars. While Japanese morale on the Zamboanga Peninsula was not on a par with that of 14th Area Army troops on Luzon, most of the 54th Independent Mixed Brigade and attached units had sufficient spirit to put up a strong fight as long as they held prepared positions, and Hojo was able to find men to conduct harassing counterattacks night after night. Finally, the terrain through which the 41st Division had to attack was rough and overgrown, giving way on the north to the rain forests of the partially unexplored mountain range forming the backbone of the Zamboanga Peninsula. Only poor trails existed in most of the area held by the Japanese, and the 41st Division had to limit its advance to the pace of bulldozers, which laboriously constructed supply and evacuation roads. Once the American troops entered the peninsula's foothills, tanks could not operate off the bulldozed roads. The next day, the 186th Regiment was deployed to relieve the fatigued 163rd Regiment on the eastern front. By the end of the month, it had expanded the front eastward and northward against diminishing resistance, ultimately forcing Hojo’s forces to retreat into the rugged interior of the peninsula.

For now, however, we will shift our focus from the Philippines to Burma to continue our coverage of the Chinese-British-Indian offensives. As we last observed, General Stopford’s 33rd Corps was aggressively advancing into Mandalay against a weakened 15th Army, while General Cowan’s 17th Indian Division had successfully captured Meiktila and was preparing to withstand the combined assaults of the 18th and 49th Divisions. Cowan's forces conducted a robust defense, managing to delay the arrival of the 49th Division until March 18 and successfully repelling General Naka’s initial attacks on Meiktila’s main airfield. Furthermore, with the reserve 5th Indian Division moving closer to the front in preparation for an advance towards Rangoon, General Slim decided to airlift the 9th Brigade to reinforce Cowan’s troops, which landed on Meiktila’s main airfield under enemy fire between March 15 and 17.

Due to the slow progress on this front and General Katamura's preoccupation with the battles along the Irrawaddy, he was unable to manage the southern units simultaneously. Consequently, General Kimura decided to assign the 33rd Army to take over the fighting in Meiktila. General Honda promptly moved to Hlaingdet, where he was tasked with overseeing the 18th, 49th, and 53rd Divisions. On March 18, he ordered the 18th Division to secure the northern line of Meiktila and neutralize enemy airfields. He instructed the 49th Division to advance along the Pyawbwe-Meiktila road and directed the 53rd Division to regroup near Pyawbwe. However, on that same day, Cowan launched a counterattack by sending two tank-infantry columns to disrupt Japanese preparations along the Mahlaing road and in the villages of Kandaingbauk and Shawbyugan. They faced heavy resistance at Shawbyugan and ultimately had to withdraw. The relentless air assaults also compelled the Japanese to operate primarily at night, limiting their ability to respond with similar force to British offensives. On the night of March 20, Naka decided to initiate a significant attack on Meiktila’s main airfield. However, with the 119th Regiment delayed at Shawbyugan, the 55th Regiment had to proceed alone, supported by some tanks, against the defenses of the 99th Brigade around Kyigon. Heavy artillery and mortar fire ultimately disrupted their assault. Meanwhile, as the 49th Division was consolidating its forces to the southeast, Cowan opted to send two tank-infantry columns to eliminate enemy concentrations at Nyaungbintha and Kinlu. Although the initial sweeps met little resistance, the 48th Brigade encountered strong Japanese positions at Shwepadaing on March 21.

The next day, Cowan dispatched two tank-infantry columns to secure the Shwepadaing and Tamongan regions, but the British-Indian forces still struggled to eliminate the enemy defenders. That night, Lieutenant-General Takehara Saburo initiated his first significant assault, with the majority of the 106th Regiment targeting the defensive positions of the 48th Brigade in southeastern Meiktila. Despite the fierce and relentless attacks from the Japanese throughout the night, they were ultimately repelled by artillery and machine-gun fire, suffering heavy casualties. On March 23, Cowan sent another tank-infantry column to chase the retreating Japanese forces; however, the reformed 169th Regiment at Kinde successfully defended against this advance. Meanwhile, on the night of March 24, Naka launched another major offensive with the 55th and 119th Regiments, managing to capture Meiktila’s main airfield. In response, Cowan quickly dispatched a tank-infantry column to clear the Mandalay road, successfully securing the area northeast of Kyigon by March 26. At this time, Honda had relocated his headquarters to Thazi to better coordinate the battle, although his troops had already suffered significant losses. For the next three days, Cowan’s tanks and infantry continued to advance along the Mandalay road while the 63rd and 99th Brigades worked to eliminate Naka’s artillery units south of Myindawgan Lake. By mid-March, Stopford’s relentless pressure had forced the 31st and 33rd Divisions to retreat in chaos. On March 20, organized resistance in Mandalay was finally shattered as the 2nd British Division linked up with the 19th Indian Division. Consequently, the beleaguered Japanese units had no option but to withdraw in disarray towards the Shan Hills to the east.

Following the collapse of the 15th Army front, the 33rd Army received orders on March 28 to hold its current positions only long enough to facilitate the withdrawal of the 15th Army. Consequently, while Cowan’s units cleared the region north of Meiktila, Honda halted all offensive actions and promptly directed the 18th Division to secure the Thazi-Hlaingdet area. Additionally, the weakened 214th Regiment was tasked with moving to Yozon to support the withdrawal of the 33rd Division, while the 49th and 53rd Divisions were assigned to contain Meiktila to the south. As the battles for Mandalay and Meiktila unfolded, the reinforced 7th Indian Division at Nyaungu faced several intense assaults from General Yamamoto’s 72nd Independent Mixed Brigade throughout March, ultimately advancing to Taungtha and clearing the route to Meiktila by the month's end. Meanwhile, in northern Burma, the 36th British Division advanced toward Mogok, which fell on March 19, while the 50th Chinese Division approached the Hsipaw area. Interestingly, the Japanese abandoned Hsipaw without resistance but launched a fierce counterattack between March 17 and 20. Ultimately, General Matsuyama had no option but to prepare for a withdrawal south toward Lawksawk and Laihka. At this stage, the 38th Chinese Division resumed its advance to Hsipaw; however, facing strong opposition along the route, they did not arrive until March 24, when the entire Burma Road was finally secured. General Sultan believed this was his final maneuver and recommended relocating the Chinese forces back to the Myitkyina area for air transport back to China, except for those needed to secure the Lashio-Hsipaw region. Additionally, the 36th Division continued its eastward push and eventually linked up with the 50th Division in the Kyaukme area by the end of the month before being reassigned to Slim’s 14th Army.

Looking south, the 74th Indian Brigade and West African forces advanced toward Kolan, while the 26th Indian Division established a new beachhead in the Letpan-Mae region. The 154th Regiment maintained its position near the Dalet River, preventing the remainder of the 82nd West African Division from joining the offensive. On March 23, General Miyazaki decided to launch an attack on Kolan. Although the assault achieved moderate success, Miyazaki soon recognized that he was outnumbered and opted to begin a final withdrawal toward the An Pass, completing this by the end of the month.

 

Meanwhile, on March 17, the 121st Regiment sent its 3rd Battalion to engage the enemy in the Sabyin area and hold their position along the Tanlwe River for as long as possible. Despite strong resistance from the Japanese, British-Indian forces managed to cross the Tanlwe by March 27 and successfully captured Hill 815 two days later. By March 30, the 22nd East African Brigade had also reached Letpan when High Command decided to relieve the units of the 26th Division and return them to India.

In a related development, tensions were rising in French Indochina, where the local government refused to permit a Japanese defense of the colony. By early March, Japanese forces began redeploying around the main French garrison towns in Indochina. The Japanese envoy in Saigon Ambassador Shunichi Matsumoto declared to Governor Admiral Jean Decoux that since an Allied landing in Indochina was inevitable, Tokyo command wished to put into place a "common defence" of Indochina. Decoux however resisted stating that this would be a catalyst for an Allied invasion but suggested that Japanese control would be accepted if they actually invaded. This was not enough and Tsuchihashi accused Decoux of playing for time. On 9 March, after more stalling by Decoux, Tsuchihashi delivered an ultimatum for French troops to disarm. Decoux sent a messenger to Matsumoto urging further negotiations but the message arrived at the wrong building. Tsuchihashi, assuming that Decoux had rejected the ultimatum, immediately ordered commencement of the coup.

The 11th R.I.C. (régiment d'infanterie coloniale) based at the Martin de Pallieres barracks in Saigon were surrounded and disarmed after their commanding officer, Lieutenant-Colonel Moreau, was arrested. In Hue there was sporadic fighting; the Garde Indochinoise, who provided security for the résident supérieur, fought for 19 hours against the Japanese before their barracks was overrun and destroyed. Three hundred men, one third of them French, managed to elude the Japanese and escape to the A Sầu Valley. However, over the next three days, they succumbed to hunger, disease and betrayals - many surrendered while others fought their way into Laos where only a handful survived. Meanwhile, General Eugène Mordant led opposition by the garrison of Hanoi for several hours but was forced to capitulate, with 292 dead on the French side and 212 Japanese. An attempt to disarm a Vietnamese garrison ended badly for the Japanese when 600 of them marched into Quảng Ngãi. The Vietnamese nationalists had been armed with automatic weapons supplied by the OSS parachuted nearby at Kontum. The Japanese had been led to believe that these men would readily defect but the Vietnamese ambushed the Japanese. Losing only three killed and seventeen wounded they inflicted 143 killed and another 205 wounded on the Japanese before they too were overcome. A much larger force of Japanese came the next day but they found the garrison empty. In Annam and Cochinchina only token resistance was offered and most garrisons, small as they were, surrendered. Further north the French had the sympathy of many indigenous peoples. Several hundred Laotians volunteered to be armed as guerrillas against the Japanese; French officers organized them into detachments but turned away those they did not have weapons for. In Haiphong the Japanese assaulted the Bouet barracks: headquarters of Colonel Henry Lapierre's 1st Tonkin Brigade. Using heavy mortar and machine gun fire, one position was taken after another before the barracks fell and Lapierre ordered a ceasefire. Lapierre refused to sign surrender messages for the remaining garrisons in the area. Codebooks had also been burnt which meant the Japanese then had to deal with the other garrisons by force. In Laos, Vientiane, Thakhek and Luang Prabang were taken by the Japanese without much resistance. In Cambodia the Japanese with 8,000 men seized Phnom Penh and all major towns in the same manner. All French personnel in the cities on both regions were either interned or in some cases executed. The Japanese strikes at the French in the Northern Frontier in general saw the heaviest fighting. One of the first places they needed to take and where they amassed the 22nd division was at Lang Son, a strategic fort near the Chinese border.

The defences of Lang Son consisted of a series of fort complexes built by the French to defend against a Chinese invasion. The main fortress was the Fort Brière de l'Isle. Inside was a French garrison of nearly 4000 men, many of them Tonkinese, with units of the French Foreign Legion. Once the Japanese had cut off all communications to the forts they invited General Émile Lemonnier, the commander of the border region, to a banquet at the headquarters of the Japanese 22nd Division. Lemonnier declined to attend the event, but allowed some of his staff to go in his place. They were then taken prisoner and soon after the Japanese bombarded Fort Brière de l'Isle, attacking with infantry and tanks. The small forts outside had to defend themselves in isolation; they did so for a time, proving impenetrable, and the Japanese were repelled with some loss. They tried again the next day and succeeded in taking the outer positions. Finally, the main fortress of Brière de l'Isle was overrun after heavy fighting. Lemonnier was subsequently taken prisoner himself and ordered by a Japanese general to sign a document formally surrendering the forces under his command. Lemonnier refused to sign the documents. As a result, the Japanese took him outside where they forced him to dig a grave along with French Resident-superior (Résident-général) Camille Auphelle. Lemonnier again was ordered to sign the surrender documents and again refused. The Japanese subsequently beheaded him. The Japanese then machine-gunned some of the prisoners and either beheaded or bayoneted the wounded survivors.

Lang Son experienced particularly intense fighting, with the 22nd Division relentlessly assaulting the 4,000-strong garrison for two days until the main fortress was captured. The Japanese then advanced further north to the border town of Dong Dang, which fell by March 15. The battle of Lạng Sơn cost the French heavy casualties and their force on the border was effectively destroyed. European losses were 544 killed, of which 387 had been executed after capture. In addition 1,832 Tonkinese colonial troops were killed (including 103 who were executed) while another 1,000 were taken prisoner. On 12 March planes of the US Fourteenth Air Force flying in support of the French, mistook a column of Tonkinese prisoners for Japanese and bombed and strafed them. Reportedly between 400 and 600 of the prisoners were killed or wounded. 

Nonetheless, the coup was highly successful, with the Japanese subsequently encouraging declarations of independence from traditional rulers in various regions. On 11 March 1945, Emperor Bảo Đại was permitted to announce the Vietnamese "independence"; this declaration had been prepared by Yokoyama Seiko, Minister for Economic Affairs of the Japanese diplomatic mission in Indochina and later advisor to Bao Dai. Bảo Đại complied in Vietnam where they set up a puppet government headed by Tran Trong Kim and which collaborated with the Japanese. King Norodom Sihanouk also obeyed, but the Japanese did not trust the Francophile monarch. Nationalist leader Son Ngoc Thanh, who had been exiled in Japan and was considered a more trustworthy ally than Sihanouk, returned to Cambodia and became Minister of foreign affairs in May and then Prime Minister in August. In Laos however, King Sisavang Vong of Luang Phrabang, who favoured French rule, refused to declare independence, finding himself at odds with his Prime Minister, Prince Phetsarath Ratanavongsa, but eventually acceded on 8 April.

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March 1945, saw US forces advance in Luzon, overcoming Japanese defenses through strategic maneuvers, while guerrilla activities intensified amid challenging terrain and heavy resistance. Meanwhile, in Burma, British-Indian forces advanced against Japanese troops, capturing key locations and in French Indochina the Japanese unleashed a brutal coup d'etat ushering in independence movements.