- 86 - Pacific War - Fall of Mubo & battle of Kolombangara, July 11-18, 1943

Last time we spoke about the amphibious assaults in New Georgia, New Guinea and the naval battle of Kula Gulf. The boys on New Guinea were edging ever closer to their objective of Lae while drawing the Japanese attention elsewhere. In the Solomons, Admiral Kusaka tossed as many aircraft as he could to thwart the multiple allied landings, but it was to no avail. Having depleted his airpower, now he turned to the navy to see if they could reinforce New Georgia before another Guadalcanal situation occurred. Rear Admiral Teruo Akiyama was given the task of launching a Tokyo Express to New Georgia while also trying to give some fight to the enemy. Aboard his flagship the Niizuka, Akiyama did indeed give a fight to the Americans, showcasing a brand new type of radar and the ever trusty type 93 long lance torpedoes. The Japanese landed a few of their boys and now the real fight for New Georgia would begin. 

This episode is the Fall of Mubo & battle of Kolombangara 

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. 

So the past few weeks we have been chaotically juggling multiple events across the Solomons and New Guinea and this week it shall be no different. So let's first jump into New Guinea. General MacArthur’s forces managed to pull off the Nassau Bay landing, getting General Savige some much needed reinforcements on his eastern flank and a new supply route. Now the landing at Nassau Bay was part of an ongoing operation codenamed Doublet, aimed at dislodging the Japanese from Bobdubi and Mubo. Taking these were necessary for the future push against Lae and Salamaua. Mubo held an airfield and its capture would greatly facilitate troop movements towards Salamaua. The movement in the interior towards Mubo was complicated by rough terrain. There were a series of ridges that could be defended sternly by the Japanese. As we have seen for weeks, Roosevelt ridge, the pimple, Green Hill, Observation hill, Lababia ridge and Bitoi ridge proved to be very heavily defended. For the Japanese headquarters, all of the allied offensives were confusing as to where exactly the main target was to be. General Nakano remained confident, Salamaua was the main target and he acted accordingly by beefing up the defense there. He ordered Major General Chuichi Muroya, the commander of the 51st infantry division to fortify and defend Salamaua. As part of this, he also ordered Muroya to dispatch around 1000 men to halt American forces trying to move up the coast towards Lake Salus.

Now by July 2nd Brigadier Moten’s plan was for the 2/6th and 2/5th battalions to take Mubo and Observation hill. While the new Taylor Force would capture Bitoi ridge and then the ridge between Bui Alang and Bui Kumbul Creeks. After this the forces would link up and the Japanese lines of communications along the Buigap Creek would be severed. While this was going on the 15th brigade who was working in conjunction with the newly landed troops, were performing an offensive directed at reducing the Japanese presence around Lae and Salamaua. Part of this offensive involved the inexperienced 58th/59th battalion who had a hell of a time facing the Japanese at Bobdubi ridge. The 58th/59th battalion were two previous militia battalions from Victoria. Initially they were a defensive force in Australia, not meant to go to places like New Guinea, but as they say times were tough. They got a taste of hand to hand combat in late june and while they did not make much progress, they still impacted the campaign, forcing General Muroya to request reinforcements so he could maintain a firm defense for the approaches to Salamaua. Nakano made it clear Bobdubi was of grave importance stating “this location is the last key point in the defense of Salamaua”. Muroya received Major Otoichi Jinno’s 1st and 3rd companies of the 80th battalion. They marched through the Coconuts area to Bobdubi bringing with them 2 mountain guns of the 26th field artillery regiment. Meanwhile Colonel Araki his 1st battalion over to the Old Vickers position. By early July Muroya now held 5 infantry companies, around 500 men strong in all. But with all the activity hitting the north, Araki became worried and ultimately decided to move his regimental HQ and 1st battalion to Komiatum, leaving only his 2nd battalion to hold Mubo. 

On July 4th, Brigadier Heathcote Hammer took command of the 15th brigade. He was a veteran of the second battle of El Alamein, one of the most iconic battles of WW2, yours truly actually wrote quite a large episode for Kings and Generals on that one, and I think by the time this podcast comes out it should as well. Anyways Hammer had taken a German bullet right through both of his cheeks, but he did not lose a single tooth in the process, I guess lucky on that count. He earned a distinguished service order for his time in the middle east and in june of 1943 was promoted to Brigadier and given command of the 15th brigade. He was considered one of the most original and magnetic leaders of the Australian Infantry. “Hard as Nails” was said to be his motto, and “as you train, so you fight” his creed. When the 58/59th battalion stalled, he was tossed into the thick of it. Now do remember he was coming directly off the victory at Alamein, so he was I guess you can call it “desert minded” when he was tossed into the unforgivable jungles of New Guinea. He would have to deal with completely different terrain, different types of troops and a different enemy than the Italians and Germans.

Another result of the delays at Bobdubi saw General Saviege dispatched Major Warfe’s commands over to stop the Japanese from escaping Mubo. On July the 5th, General Savige ordered Hammer to send the company towards Tambu Saddle and Goodview Junction where they could cut off the Komiatum Track, thus preventing the Japanese from escaping Mubo to the north. Meanwhile B Company were on the Bench Cut Track carrying out ambush attacks. The two mountain guns brought up to the old vickers position were sporadically hitting Australian positions to their misery. C Company was performing a diversionary attack, while D Company was trying to capture the Coconuts and were successful at taking its northern region by nightfall on July 6th. The next day, the 80th regiment were pushing the 58/59th battalion back as air attacks from 6 Bostens hit the Old vickers allowing C Company to charge in with further support from D Company’s mortars. The men charged up the steep ridge into Japanese machine gun nets and pillboxes. Likewise the 1st company of the 80th regiment with support of the 1st battalion, 66th regiment were launching counterattacks out of Komiatum. The Japanese managed to ambush some Australian supply lines inflicting casualties. On July 9th, the Australians tried to charge again into the Old Vickers, through a Sugarcane Knoll, but it went the exact same as last time, the machine gun nests and pillboxes were simply too much. Bobdubi ridge proved a tough nut to crack, but all of the activity was causing more and more Japanese units to move away from Mubo. By this point Mubo was being defended by 950 men and of those 770 were front line soldiers of the 66th regiment and the 14th field artillery regiment.

And so the time was ripe to hit Mubo. Moten tossed Companies A and B from the 2/6th and C Company from the 2/5th towards Buiapal Creek; C Company of the 2/6th at Lababia ridge; D company of the 2/6th at the Saddle and the remainder of the 2/5th battalion into reserve. Warfe’s commands went to work cutting off the escape route along the Komiatum track at Goodview Junction, but his forward units were spotted by Japanese patrols. As the commandos approached the area the Japanese came down from Orodubi ambushing them at Ambush Knoll…because of course its named that, silly Aussies, and this resulted in some lost supplies. Hammer was determined not to be thwarted by any delays so he ordered Warfe to launch a counterattack immediately. The Commandos were able to push the enemy back and reclaim their lost supplies, some of which were mortars and machine guns. On the night of the 6th, Warfe was ordered to leave a force to secure Wells junction while the rest of his men would proceed to cut off the escape route.

During the morning of July 7ty, Moten’s leading companies were wading through waste deep water in the Buiapal Creek due south of Observation Hill. The allied assault against Mubo was set to begin at 9:30am on the 7th, with Mitchell bombers coming in to strafe Kitchen Creek, Woody Island and Observation Hill. After this some Botsons and liberators would likewise bomb and strafe the same targets. The view from the ground was quite the spectacle for Moten’s men. It looked like the entirety of the Mubo valley was being enveloped in thick black smoke and flames as the bombers dropped their payloads. Over 159 bombers and fighters dropped 109 tons of bombs over the Mubo area. Even if the bombs did not directly cause casualties among the Japanese in the area, it still caused chaos.

Once the air attacks dissipated, the ground forces opened up their artillery and charged. A company of the 2/5th advanced without encountered any opposition, successfully climbing the northern slopes of Observation Hill. The southern slopes proved much more difficult with the Japanese putting up a fight against B company. B Company were forced to take a defensive position in a Kunai patch southwest of the slopes of Observation Hill. During this time, the Artillery over at the beaches of Nassau Bay were being moved further inland and would arrive at Napier by July 8th. This allowed Taylor Force to have the guns necessary to launch an assault of Bitoi ridge. Taylors men managed to get to the southern slopes of the ridge by 3pm while A Company touching its forward crest. B Company likewise broke through to the north and got to a point between Kitchen and Bui Savella Creek. A Company attempted another assault against Observation Hill but was repelled again, prompting Captain Dexter’s D company to be sent to reinforce them. July 9th saw numerous patrol clashes as the Australians prodded deeper and deeper into the area. In the afternoon the Japanese sent a strong counterattack against the 2/5th companies seeing fierce fighting. As noted by Arthur Pearson of D company “In most cases we were firing blind, but sometimes we were abl to pick up the smoke from their rifles”. Pearson  at one point jumped into a weapon pit, trying to draw the Japanese fire his way. A bullet came at him, piercing the stock butt of his rifle, before slamming into one of the soldiers beside him killing the man. Pearson had no idea where the bullet had come from and frantically fired into the jungle hoping to hit the Japanese sniper. The next day saw a lot of the same, more patrol clashed. On the 10th, B Company engaged the enemy around Kitchen Creek. Meanwhile US infantry had cut the main track north of Bui Alang Creek on the 9th. The Americans began advancing down to Buigap Creek, then south to the Komiatum Track by July 10th, before hitting Buigap where they drove off a bunch of Japanese. The Americans now guessed the Japanese on Mubo were using a route north east along the Buikumbul to withdraw to Mount Tambu. With the Australian and now Americans infiltrating the sector, General Nakano ordered the Mubo garrison to pull out on the 11th, back over to Komiatum. To mask their withdrawal the Japanese planned to begin moving after sundown. By July 13th, they made their way along the Saddle to Mount Tambu, but the Americans had spotted them and gave them hell using artillery. The Japanese got out, but suffered many casualties doing so.

On July the 12th, with the Japanese leaving the area, the Australians seized the Pimple, Green Hill and Observation hill with little opposition. Thus the allies had finally driven the Japanese out of their positions near Mubo, but they had also allowed them to escape. It turned out to be quite the fiasco with General Savige and Herring both believing they controlled the US troops of the 162nd, but in truth General Fuller refused to relinquish command to either. This confusion helped the Japanese squeeze out, though they did suffer 313 deaths and 981 casualties. The Australians received around 300 casualties. Mubo had fallen, its airfield was captured, mop up operations would go on for sometime, but most of the Japanese outposts were cleared. The path to Salamaua and Lae was ever closer. But now we are heading east over to the Solomons.

General Wing’s 172nd and 169th regiments were assembling at Zanana by July 6th. Their task now was to advance along the Barike River towards Munda. Meanwhile on the northern coast of New Georgia Colonel Liversedge’s men successfully landed at Rice Anchorage by July 5th. His force was the 1st Marine Raider battalion, the 3rd battalion, 148th infantry and Companies K and L from the 145th infantry. His men began their advance south towards what is known as the Dragons peninsula. At the same time, as a result of the battle of Kula Gulf, the Japanese were able to land some men of the 13th regiment over at Vila. Defending Vila were forces led by Colonel Tomonari Satoshi. With more men on hand, General Sasaki intended to move the troops via barge through Bairoko so they could reinforce Munda. Sasaki had already brought his 3rd battalion, 229th regiment from Vila using barges. He was lucky the first time but now he felt the Americans would try to attack the airfield directly, perhaps by setting up artillery on the nearby Hopei island. Roviana island likewise could be used as a staging area for amphibious tanks to charge over. Thus Sasaki brought over some 8cm dual purpose guns and 13mm anti aircraft machine guns to try and defend the beaches. He also ordered Major Sato’s 2nd battalion of the 229th regiment to dig some anti-tank ditches along the beach with the intent to smash any enemy tanks at the waters edge. He received word of the landings made at Zanana on July 3rd, prompting him to quickly reinforce his eastern line that ran north from Ilangana point. By July 6th, he had the 3rd battalion, 229th regiment and Sato’s 2nd battalion holding positions along the the Ilangana line with a roadblock position held by a company who were using felled trees and barbed wire in front of Barike. Sasaki also had at his disposal a company of the Kure 6th SNLF led by Commander Okumura Saburo at Bairoko with a small detachment of the 2nd battalion, 13th infantry led by Major Obashi Takeo. 

Meanwhile General Wing managed to get most of his 172nd regiment to the mouth of the Barike, but the 2nd battalion of the 169th remained on Rendova and the 1st and 3rd battalions were moving inland towards the Japanese roadblock. Unfortunately for the 3rd battalion, they had not found the roadblock by the night of july 6th and dug in just a bit east of it. They did not establish a good perimeter for their fox holes, there were no trip wires or barbed wires anywhere. Thus when the darkness came, so did the Japanese from the roadblock. The Japanese performed their classic infiltration tactics. The men in the foxholes began to hear random screaming, the odd firing of rifles all around them. The Japanese began to infiltrate their perimeter with one soldier reported that Japanese troops were approaching while calling out company code names in English. It was a brutal night to be sure. The shaken men of the 3rd battalion advanced with I company leading the way. They found themselves running into Japanese machine gun positions by 10:55pm around the Munda trail. They retaliated with mortars and machine guns, but could not properly see where the enemy was. Luckily B company from the 172nd showed up attacking the roadblock from the rear. In the carnage 3 platoon leaders were wounded, K Companies commander was killed, no progress was being made. Firing lanes were drawn out, the Americans were trying to find the enemy but their muzzle blasts were tiny. Some of the Americans tossed grenades, but they could not get close enough to effectively do it. By 3:30 the 3rd battalion withdrew from what they called “blood hill” to dig in for the night, but the Japanese continued to harass them. According to the 169th infantry “it was a sleepless night spend under continued harassment from enemy patrols speaking English, making horror noises, firing weapons, throwing hand grenades, swinging machetes and jumping into foxholes with knives” 

On the 8th, the roadblock was overrun costing the 3rd battalion, 169th regiment and B company of the 172nd 6 deaths and 13 wounded. The next day the 169th finally got to their assembly point at the Barike line, while Colonel Liversedge and his men were crossing the Tamaku river. Colonel Liversedge planned to send Colonel Griffiths 1st Raiders with 2 companies of the 145th regiment to swing around the west shore of the Enogai Inlet prior to assaulting Bairoko while the 3rd battalion, 148th regiment would advance over to the Munda-Bairoko trail to cut off Munda from reinforcements. Liversedge estimated taking the Enogai Inlet and cutting off the trail would be done by July 8th, and it was critical it was done speedily as his men only had 3 days rations on hand. In the late afternoon of the 7th, the 148th managed to reach the trail and created a roadblock the following day. Griffiths team and secured the villages of Triri and Maranusa, clashing with a few Japanese patrols along the way. After capturing the villages the men came across some Japanese documents showcasing the defense plan for Enogai. On the 8th, the Raiders moved out of Triri enroute to Enogai only to run into an impassable mangrove swamp. Meanwhile Major Obashi launched a counterattack against Triri which would be eventually repelled. Griffith got the men to resume the advance using another trail west of the swamp and found themselves around Leland Lagoon where they clashed with some Japanese. 

The morning of the 9th, saw General Wings main advance began. At 5am General Barkers 3 battalions of artillery positioned on both shores of the Honiavasa passage and some 155mms on Rendova opened fire on Munda. The artillery put several thousand rounds of 105mm and 155mm high explosives upon Munda. This was followed up by a naval bombardment by the USS Farenholt, Buchanan, McCalla and Ralph Talbot who were firing from the Blanche Channel, showering Munda with over 2000 5 inch shells. Then on top of all that 107 Dauntless and Avengers dropped 79 tons of bombs over Munda, Enogai and Bairoko harbor beginning at 8:30am. The Japanese recorded that the area was lit up as if it were daytime. The 172nd regiment forded the Barike, the 169th was unable to move because of the battle against the Japanese roadblock.

On the night of July 6th, Admiral Samejima sent the rest of the troops that were supposed to be transported during the battle of Kula Gulf, the 2nd battalion of the 13th regiment, some 1200 men. They were aboard 4 destroyers, the Matsukaze, Yunagi, Mikazuki and Satsuki escorted by the cruisers Sendai and Chokai and 4 other destroyers the Yukikaze, Hamakaze, Tanikaze and Yugure. They only saw some harassment from a small strike force consisting of 5 PBY’s as they made their way to Vila and safely returned. Admiral Kusaka requested some naval reinforcements from the Combined Fleet, so Admiral Kogo send Admiral Nishimura’s Cruiser division 7, arriving on the 11th. Alongside this, Rear Admiral Izaki Shunji came over with light cruiser Jintsu and destroyer Kiyonami, taking command of the reinforcement unit.

Back on land, the Kure 6th’s batteries were firing upon Rice Anchorage prompting Griffith to begin the assault of the Enogai Inlet. Supported by mortars, B Company stormed the village of Baekineru. The Japanese began withdrawing from Enogai allowing the Americans to seize it by the 11th. This came just in time as the Raiders had run out of food and water. The raiders had paid heavily, suffering 47 deaths, 80 wounded and 4 men missing. The Kure 6th SNLF would report 81 deaths and a platoon of 50 men lost. The heavy losses forced Liversedge to request the 4th raiders be landed for the capture of Bairoko, but they would only arrive on the 18th. Meanwhile Colonel Tomonari brought forward his 1st and 3rd battalion to Bairoko to help reinforce Munda. At around 4pm, the 3rd battalion led by Colonel Takabayashi attacked the American roadblock, nearly dislodging them. By nightfall the Japanese took up a position on a ridge to the 148th’s northern flank. There was a series of counterattacks until the next day saw a bit of a stalemate, then the morning after that the Japanese backed off. The 148th regiment would hold onto the roadblock for more than a week, but would quickly run low on food. It mattered not however as the Japanese just advanced along another trail further west, prompting Liversedge to order the roadblock abandoned on July 17th.

Now Admiral Kusaka wanted to reinforce the important volcanic island of Kolombangara. Kolombangara was a perfectly round stratovolcanic cone soaring out of the sea to an altitude of 5800 feet. The Japanese had a garrison at Vila airfield on the islands southern shore. The island was often to put men and supplies upon barges that would make nighttime transits across the straits to Munda point. Kusaka sought to toss another 1200 troops, Major Yamada Tadaichi’s 2nd battalion, 45th regiment and the 8th battery, 6th field artillery. Transporting them would be Matsukaze, Yunagi, Minazuki and Satsuki coming from Buin, escorted by Admiral Izaki’s aboard the Jintsu alongside 5 destroyers Mikazuki, Yukikaze, Hamakaze, Kiyonami and Yugure coming from Rubaul. Unfortunately for the IJN, allied coastwatchers saw reported their movement and Admiral Halsey responded by ordered Admiral Ainsworth and task force 18 to intercept them. Ainsworth had light cruisers USS Honolulu, St Louis, the Royal New Zealand light cruisers HMNZS Leander; destroyers USS Nicholas, O’Bannon, Taylor, Jenkins, Radford, Ralph Talbot, Buchanan, Maury, Woodworth and Gwin. Half of Ainsworth’s forces came from Captain Ryan’s Destroyer squadron 12 who were quite inexperienced. Ainsworths set up his force making his vanguard the Nicholas followed by O’Bannon, Taylor, Jenkins and Radford. Honolulu, Leander and St Louis followed in the center. Ainsworth specifically placed Leander in the middle because she held inferior radar, he preferred St Louis to take the lead out of the Cruisers. Ryan’s destroyers would take up the rear with Ralph Talbot, followed by Buchanen, Maury, Woodworth and Gwin. By 5pm task force 18 was sailing once again for the Kula Gulf.

Task Force 18 had left Tulagi at 5pm on July 12th under clear skies and calm seas. As they passed Savo Island, Ainsworth took a course along the west coast of Santa Isabel island hoping to use it to hide his force from Japan reconnaissance aircraft. At 12:35am a PBY reported the course and composition of Izaki’s force, and Ainsworth heading in for the intercept. As the two forces were converging, Izaki dispatched his Destroyer transport through Vella Gulf to unload the troops but at 1am he was alerted of the approaching enemy. It was actually the Americans who established radar content first, but the Japanese gained visual contact by 1:08am

As the two forces converged, Izaki sent his destroyer transports through Vella Gulf; yet by 01:00, the Americans detected his force. However it was actually the Japanese who detected the Americans first for almost 2 hours or so because of the electromagnetic impulses the American radar systems emitted. The Japanese crews had managed to gain a fairly accurate picture of Ainsworths disposition. At 1:08 the Japanese made visual contact and were the first to attack, launching 29 torpedoes by 1:14am. Ainsworth’s vanguard increased speed to engage the Japanese with their torpedoes while the cruisers turned to deploy their main batters and engage to starboard. Ainsworth yet again ignorant of the type 93 long lance capabilities had no idea the fish were already in the water coming towards his force as they watched the Japanese destroyers turn away. The American destroyers tossed 19 Mark 15 torpedoes, but the Japanese were over 10,000 yards away and turning north thus completely wasted the volley. When the Japanese were 10,000 yards or so Ainsworth cruisers began opening fire, concentrating on the Jintsu.

When the Japanese column closed to 10,000 yards at 01:12, Ainsworth ordered his cruisers to open fire, concentrating on the Jintsu which was leading. Honolulu and St Louis fired an incredible amount of shells for 18 minutes at 1100 and 1360 6 inch rounds joined by 350 5in rounds. The Leander fired 160 6 inch rounds. The Jintsu was hit first to her rudder, then her bridge killing Izaki, followed by 10 or more shells to her engineering spaces. She was a doomed burning ship, that came to a dead drift quickly. The Americans then launched another volley of torpedoes, 21 in all, but they would all fail to hit a mark. By this time, the Japanese torpedoes were finally arriving. Leander was hit at 1:22 forcing Ainsworth to detach Radford and Jenkins to help her limp away. The rest of Ainsworth forces managed to avoid the torpedoes.

While this was occurring the destroyer transports had successfully unloaded the 1200 troops and were moving north to withdraw with Izaki’s other destroyers. The Japanese were not running away however, they were getting to a safe position to reload torpedoes and re-engage. After finishing off the Jintsu at 1:45, Ainsworth ordered the force to pursue the enemy going northwest. They made radar contact again at 1:56, but Ainsworth doubted the blips to be the enemy, but rather his vanguard ships. Instead of opening fire, Ainsworth attempted making contact with the vanguard force and began firing starshells, this would prove to be a fatal error. The Japanese launched another volley of 31 torpedoes. At 2:08 the first to be hit was St Louis, it opened her bow, next Gwin was hit near her No 2 engine room; Honolulu was third receiving a hit to her starboard bow at 2:11, with another hitting her stern without exploding. Honolulu’s rudder jammed and she nearly smashed into Gwin coming within 50 yards of her. That effectively ended the battle as Ainsworth ordered the task force to withdraw back to Tulagi. The Gwin had lost 61 men and was forced to be scuttled, Leander lost 28, the Jintsu 482 and another Japanese Admiral was dead. 21 survivors of the Jintsu were rescued later on by the I-180, a few others were picked up by American ships. The Japanese had won a tactical victory and demonstrated yet again their superior night fighting techniques. But it was a pyrrhic victory in many ways as well, the Americans could afford to lose ships, the Japanese could not.

 

After the defeat, Admiral Nimitz decided to change tactics and not confine anymore cruisers to the Solomons as they could not hope to chase the IJN destroyers and their troublesome torpedoes were a major threat. Nimitz wrote a letter to Halsey suggesting that a well trained squadron of 2100 ton Fletcher class destroyers would be better suited to such waters rather than cruises. Halsey argued despite the Japanese having superior torpedoes, he believed Ainsworth’s night battle plan A, that had employed SG radar with radar directed gunnery were still superior to anything the IJN had. He thought the solution “appears to be the greatest volume and weight of gunfire that can be incorporated into a highly maneuverable unit–and a unit that is certainly not appreciably weaker than the enemy unit.” Regardless Halsey went to work designating two squadrons of 2100 ton destroyers to take over New Georgia operations and would not risk anymore of his cruisers going up the Slot on any more missions.

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The New Guinea and New Georgia campaigns were seeing gradual progress for the allies, but the naval battles were much less to be desired. While the Japanese were earning some victories, they were rather pyrrhic in nature as American production was winning the day.