Bombing of Yawata (June 1944)

The first United States Army Air Forces (USAAF) raid on Japan took place on 18 April 1942 when 16 B-25 Mitchell medium bombers flying from an aircraft carrier attacked several cities during the Doolittle Raid. Although this raid caused little damage, it boosted morale in the United States. The Japanese government responded to the attack by both increasing the number of fighter units based in the home islands and conducting an offensive in the Pacific Ocean which ended in defeat during the Battle of Midway.[1] The USAAF was not able to mount further attacks on the Japanese home islands after this raid, however, as none of its combat aircraft had sufficient range to reach this area from bases in China or the Pacific until the B-29 Superfortress heavy bomber was ready for combat.[2]

The B-29 Superfortress had a difficult introduction into service. Work began on designing the bomber in early 1940 and the first prototype flew on 21 September 1942. The Superfortress was the largest combat aircraft of World War II and boasted a heavy maximum bomb load, long range and powerful defensive armament.[3] The B-29 also incorporated a number of new features such as a pressurized cabin and remote-controlled turrets. While 1,664 B-29s had been ordered by the USAAF before the aircraft first flew, its development was set back by several months after the second prototype crashed on 18 February 1943 and problems with the design were gradually solved.[4] The 58th Bombardment Wing was formed in June 1943 to operate the USAAF's first B-29s but it did not begin receiving these aircraft until October. The slow delivery of B-29s and mechanical problems with the aircraft meant that the wing lagged behind its training schedule, and only became capable of deployment in March 1944 after the so-called "Battle of Kansas" program began to produce combat-ready aircraft.[5]

In late 1943 the United States Joint Chiefs of Staff approved a proposal to begin the strategic air campaign against the Japanese home islands and East Asia by basing B-29s in India and establishing forward airfields in areas of China. This strategy, which was designated Operation Matterhorn, required the construction of large airstrips near Chengdu in inland China which would be supplied by Allied cargo aircraft and be used to refuel B-29s traveling from bases in Bengal en route to bombing targets in Japan.[6] XX Bomber Command was assigned responsibility for this effort and its ground crew began to leave the United States for India by sea in December 1943.[7][8] The Twentieth Air Force was formed in April 1944 to oversee all B-29 operations. In an unprecedented move, the commander of the USAAF, General Henry H. Arnold, took personal command of this unit and ran it from the Pentagon.[9] The 58th Bombardment Wing was XX Bomber Command's main combat unit, and its movement from Kansas to India took place from April to mid-May.[10] While the wing had not completed training at the time it left for India, its combat groups were more experienced than most newly deployed USAAF bomber units.[11]

The 58th Bombardment Wing's B-29s began moving from India to the forward bases in China on 13 June. By 15 June 83 Superfortresses had reached the four forward airfields around Chengdu, though at least 12 turned back before reaching China and another crashed causing the death of its entire crew. Each of the aircraft had departed India carrying the 2 short tons (1,800 kg) of 500-pound bombs they would use in the raid. A large number of staff officers, including eight generals, also traveled to Chengdu to observe the operation but were not allowed to participate in the raid. The bomber crews were joined by eight journalists and three news photographers, however.[31] At the time the USAAF had few recent photos of Japanese industrial areas and the bomber crews were briefed on Yawata using maps and photos from the late 1920s and early 1930s.[32]

The Superfortresses began to depart their bases at 16:16 local time on 15 June.[33] The raiding force was led by the 58th Bombardment Wing's commander, Brigadier General Laverne G. Saunders.[18] Of the 75 aircraft dispatched one crashed immediately after taking off with no casualties and a further four turned back suffering mechanical problems. The remaining aircraft proceeded on a direct course to Okino Island where they turned for the run-in to Yawata.[33] Each of the 58th Bombardment Wing's four groups sent two aircraft ahead to mark the target and the other aircraft flew in a long bomber stream; both of these tactics had been adopted from those used by the British Royal Air Force's Bomber Command in Europe.[34] The raiders were detected by Japanese Army and Army Air Force units in China. These reports were passed onto the 19th Air Brigade, which estimated that the bombers were bound for northern Kyūshū and would arrive there at about midnight local time. A radar station and lookout posts on Cheju-Do subsequently detected the bombers from 23:31 to 00:30 local time. An air raid alarm was issued at 00:24 and 24 aircraft of the 4th Air Regiment began to take off three minutes later to patrol over northern Kyūshū.[35] The 59th Air Regiment was not scrambled as its pilots had not worked with those of the 4th Air Regiment in night operations, its aircraft were suffering from mechanical problems and it was feared that the B-29s would sight and attack the base at Ashiya.[36]

B-29s began to arrive over Yawata at 00:38 local time and the attack on the city lasted almost two hours. Only 15 of the American aircraft were able to aim their bombs visually as the city was blacked out and obscured by smoke or haze; the other 32 bombed by radar. Two further B-29s bombed Laoyao harbor and another five struck targets of opportunity; overall 107 tons of bombs were dropped during the raid.[37][38] After the first bombs were released regular updates on the operation were transmitted to the Twentieth Air Force's headquarters in Washington, from where they were relayed to Arnold who was in London at the time.[39] The raiders were met with heavy but inaccurate anti-aircraft fire and the searchlights stationed around Yawata were not effective.[33] The 4th Air Regiment achieved the only kill of the night when one of its fighters shot down a B-29. The Regiment's other aircraft struggled to make contact with the bombers and achieved few interceptions.[40]

The B-29s' return flight to China was largely uneventful. One of the Superfortresses was strafed and destroyed by Japanese aircraft after landing at Neihsiang with engine trouble and a further two aircraft crashed with the loss of their entire crews and a correspondent from the magazine Newsweek.[41][42] Overall American losses in the raid were seven B-29s destroyed and a further six damaged by anti-aircraft guns; 57 airmen and one journalist were killed aboard these aircraft.[43] Many of the B-29s were stranded in China for several days after the raid due to fuel shortages there, and only returned to India after Wolfe borrowed 15,000 US gallons (57,000 l) of fuel from the 312th Fighter Wing's supplies. During this period the bombers were highly vulnerable to Japanese retaliatory raids, but none came about.[41]

Little damage was caused by the raid on Yawata. On 18 June a USAAF Fourteenth Air Force aircraft overflew the city and photographed the target area. These photos showed that only a single bomb had landed within the Imperial Iron and Steel Works complex, and it had hit a powerhouse 3,700 feet (1,100 m) from the nearest coke oven. Light damage had also been inflicted on Kokura Arsenal and other industrial and civilian buildings in the area. Despite a USAAF policy of encouraging factual reportage of B-29 operations, the raid's results were overstated in the U.S. media.[44] The light combat losses suffered by the raiders and electronic intelligence collected by the B-29s revealed the ineffectiveness of Japanese radar and air defenses. As a result, the USAAF dispatched a single photo reconnaissance B-29 to overfly much of Japan and Korea on 21 June. This sortie was successful, and greatly improved U.S. intelligence holdings on these areas.[45]

The Yawata raid revealed serious shortcomings in Japan's air defenses. While the 19th Air Brigade initially claimed to have shot down eight B-29s and damaged a further four, it was soon determined that only two of the bombers had been destroyed. This loss ratio was considered too low to defeat attacks on the home islands. The raid demonstrated that Japan had too few air bases and not enough aircraft were available for night operations. It was also found that the Toryu fighter was not well suited to intercepting B-29s as it was slower than the bombers, too lightly armed and most aircraft lacked radar. While the air raid alert system had proved successful in this instance, the radars which detected the American aircraft had been unable to determine their altitude and it was decided that there was a need to further expand radar coverage.[46] The performance of the 131st Anti Aircraft Regiment during the raid was judged to be so poor that its commander was transferred to Manchuria.[47] News reports of the Yawata raid and successful U.S. landing at Saipan on the same day also indicated to Japanese civilians that the war was not going well.[39] In response to the raid Japanese Government ministers urged families living the country's four major cities to evacuate their children to rural areas.[48]

The 15/16 June 1944 raid on Yawata marked the beginning of the USAAF's strategic bombing campaign against Japan.[49] The city was struck again by B-29s during daylight and night raids on 20 August, but no serious damage was caused.[50] XX Bomber Command conducted 49 raids from its bases in China and India between June 1944 and March 1945, of which nine were made on targets in the Japanese home islands, but Operation Matterhorn did not achieve its goals. Despite initial problems, XXI Bomber Command's operations from the Mariana Islands, which began on 28 October 1944, proved much more effective. As a result, XX Bomber Command was transferred to the Mariana Islands in early 1945.[51][52] Yawata was targeted again by B-29s on 8 August 1945, two days after the atomic bombing of Hiroshima. On this day the city was attacked by 221 B-29s escorted by three groups of P-47N Thunderbolt fighters including the 318th fighter group based on Ie Shima off the coast of Okinawa. The bombers were armed with incendiary bombs and the resulting firestorm destroyed 21 percent of Yawata's urban area.[53]

• ^(I) The Kawasaki Ki-45 Toryu and Kawasaki Ki-61 Hien were assigned the reporting names of 'Nick' and 'Tony' respectively by the Western Allies.[54]

• Bombing of Yawata

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