brhugo
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Part XI: Breaking the DEI Barrier With the Rabaul campaign wrapped up and most of its occupying troops freed up for the next phase of the allied advance, planning began for the reoccupation of Java and Sumatra. The island of Timor was identified as a necessary stepping stone in the path from Australia and Java and an invasion force formed up for Lautem on the eastern tip of Timor and left Rabaul on 7/12/43. The landings were preceded by a battleship bombardments on 7/19 and began on 7/21. The Japanese opposed the landings vigorously but not with aircraft carriers: in incredibly unlucky timing, on the same day that the first troops hit the beach at Timor the Kaga and her air groups were located midway between the Hawaiian islands and the West coast as they savaged an eastbound convoy. With the threat of a seaborne air attack diminished, the heavy escorts were split from their carrier task forces and subjected Lautem to another heavy bombardment on 7/23/43. The Lautem invasion also caught a Japanese reinforcement convoy flat-footed. Carrier planes sank several transports and merchants in the area and sent the rest scattering, many with smoking holes in their decks. Over the next two weeks the Japanese attempted to maintain their garrison with smaller vessels making quick runs with troops and supplies the these efforts were costly in the face of US carrier air strikes. Lautem fell to the allies on 8/8/43 after heavy fighting that had continued nearly every day since the initial clashes. With Lautem secure, the second stage of the Timor offensive began with landings at Koepang on the opposite end of that island on 8/16/43. Initially the only defensive successes were those obtained by I-boats which managed to put two torpedoes into the CV Essex. But by 8/23/43 Japan had managed to gather its strength for a series of night surface actions. The first pitted the three Japanese heavy cruisers and three destroyers against a larger defending allied force of three CA’s, five CLs, and 3 DD’s. The Japanese had lost little of their skill at night fighting and the CA Quincy was mortally damaged in exchange for the CA Atago. But the advantage went to the allies when carrier aircraft put two torpedoes into the withdrawing CA Haguro the next morning. The Japanese were back four nights later in another action is which they were outgunned and yet outfought the allies: the CA San Francisco was torpedoed in an action that resulted in damage to the CA Maya and DDs Shimakaze and Hatakaze. This time it was the Japanese who managed to maul a damaged survivor – the San Francisco was torpedoed and sunk by a submarine. And four days after this battle the Japanese were back with the CA Takao, CA Suzuya, CL Abukuma, and two destroyers against a surface group almost twice that size. The CA Canberra was torpedoed and hit nine times and survived only by a timely flooding of the magazine spaces. The Takao was also hit several times shell fire and was reported to be heavily damaged and engulfed in flame. The Abukuma and DD Huroshio were also hit but managed to escape detection by carrier aircraft the next day. But a strike by unescorted Betties slipped past the transport group and managed to hit the CVE Breton with a 500 lb bomb. None of these measures could stop the inevitable; Koepang was wrested from the Japanese the next day (9/1/43). The Japanese carriers that had struck the sea lane between Oahu and the west coast in late July made an appearance again on 9/7/43, but it was not in opposition to the Timor landings. Instead the Kaga and Shokaku had slipped by a weak allied air search screen into the Indian Ocean and ambushed a Capetown convoy. Thirteen merchants were sent to the bottom and several others were forced to scatter for friendly ports. Their next target was Addu which was hammered by air strikes. The Enterprise and Saratoga had been operating in this general area providing cover for the Colombo and Madras convoys to Akyab, but the Enterprise was in the Colombo shipyard having I-boat torpedo damage repaired and no serious consideration was given to taking on the two Pearl Harbor veterans with just the Saratoga. Just as the commitment of the Japanese carriers to convoy raiding had left the Timor theater free for aggressive allied action, the concentration of allied carriers near the Timor seemed to give the Japanese the green light for use of their still formidable surfaces forces against Rabaul. It was a disaster. The first victims were CLs Oi and Isuzu which were first damaged by SBDs and TBFs from Rabaul and then run down and demolished by an allied cruiser group. Then a Japanese surface group containing battleships was sighted north of New Britain. A dive bomber attack scored no hits but Avengers put two torpedoes into the Hiei. An afternoon strike added another torpedo hit to the Hiei’s woes. The enemy task force pressed on through the night and engaged a defending cruiser group in a confused night action pitting the BB Nagato, CA Mogami, CL Kiso and three destroyers against two CAs, four CLs, and 3 destroyers. The Kiso and Northampton took the brunt of the damage but the latter at least survived the action. The two battered forces took their worst losses the next day from other platforms; the CLAA Atlanta was torpedoed and sunk by a submarine and the still floating Hiei was found by Avengers again and was sunk by three torpedoes. The Japanese had not yet run out of ships and on 9/11 an apparent second prong in the surface operation was bent back when SBDs based at the Shortlands damaged the CA Mikuma. This ship was still limping back to safety when a force of new aircraft carriers making its first transit from the West coast to Rabaul detected the Mikuma and her escort. Despite the air groups having a large number essentially green combat pilots, the Mikuma took (reportedly) eight bomb hits and the DD Kisaragi was hit once. As the invasion of Koepang was wrapping up and final preparations were being made for the next action (landings at Maumere on the island of Flores) the Japanese carrier force finally made an appearance. The carriers supporting the landing of supplies and reinforcements at Koepang were attacked by a strike of 25 Zeros and 32 Jills flying from a previously undetected carrier group operating southeast of Celebes. 62 Hellcats and Wildcats providing air cover shot down seven of the escorts and 20 of the torpedo bombers and drove the remaining aircraft off before the strike got to within anti aircraft gunnery range of the allied forces. The carriers covering the landings could not pursue the Japanese without leaving the amphibious groups vulnerable to land based air attack, so the carriers that had just arrived at Rabaul were ordered to make a sweep around New Guinea to neutralize any other approaching Japanese warships and to hopefully catch and neutralize the Celebes carriers. The resulting carrier battle, dubbed the “Battle Off Biak” in Morrison’s classic account, began as the US carriers steamed along the northeast coast of New Guinea. Japanese long range reconnaissance planes had been shadowing the task force since before it departed Rabaul and the Akagi, Kaga, and Shokaku were waiting within range of land based air support of Biak, Sorong, and Babeldaob. The initial setup was almost perfect for the Japanese: attacking from beyond counterstrike range of the heavier allied bombers, the Japanese carriers launched three waves of Zeros, Jills, and Vals before noon. The third strike even managed to coordinate with additional land based escorts. All three waves were shredded by the combat air patrol; only during the third strike did any of the attacking aircraft manage to make runs on their targets and these resulted in no hits. The US carriers steamed toward their Japanese counterparts through the morning and were able to launch strikes at maximum range just after noon. As the US task force waiting for the results of this attack, more enemy strikes arrived. A total of 21 Zeros, 54 Vals, and 5 Jills attacked in three waves; none managed to penetrate the CAP. TBFs found the Akagi and put a torpedo into her, the Kaga was hit by three bombs and four torpedoes. The Shokaku was also present but managed to avoid being attacked. A late evening strike scored seven bomb hits on the Akagi and three on the Kaga and this time the Shokaku did not escape attention, taking four bomb and one torpedo hit. Air losses for the day were 19 F6Fs, 12 F4F’s, 22 TBDs and 4 SBDs in exchange for 71 Vals, 29 Zeros, 8 Kates, and 5 Jills. The next day was a cleanup action. A single strike from the unblemished US carriers found the Akagi, already devastated by a reported torpedo and seven bomb hits, still afloat and remedied this with an additional two torpedo hits. The last large carrier battle of the war was over. The Japanese obtained some consolation when the CVL Bellau Wood and CV Essex were each hit twice by submarine launched torpedoes on 9/29 and 10/11 respectively, but both ships survived to reach repair facilities and were back in the war within a few months. But allied intelligence assessed the Akagi, Kaga, and Shokaku as sunk. Maumere fell to the allies on 9/29/43. The way was cleared for the invasion of Java.
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