Burma Victory, 1944–1945
By Jon Diamond
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About this ebook
Jon Diamond
Jon Diamond is a practising physician who has had a life-long interest in military history. A graduate of Cornell University, Jon has been on the faculties of Harvard Medical School and Pennsylvania State University. He has served as a civilian attendee to the United States Army War College National Security Seminar in Carlisle, Pennsylvania and has written a significant number of articles and papers including over fifteen for Military Heritage Presents WWII History. He is the author of a book on David Low's Cartoons and the British Policy of Appeasement. He resides in Hershey, Pennsylvania.
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Burma Victory, 1944–1945 - Jon Diamond
Chapter One
The IJA’s 1942 Conquest of Burma and the 1943 Allied Response
Within the British Empire, Burma was the land link connecting India and Malaya. If the British bastions of Malaya and Singapore were to fall to the Japanese, then India might be assaulted via an overland offensive through Burma after Imperial Japan’s Pacific and South-East Asian blitzkrieg against Allied possessions commenced on 7 December 1941. However, Burma’s harsh terrain was counted on as being an Allied force-multiplier to protect India from Japanese invasion.
Burma is surrounded by mountain ranges and covered in thick jungle (see Map 1). Four rivers flow south into the Bay of Bengal and the Andaman Sea. The Irrawaddy and its major tributary, the Chindwin, rise in the Himalayas to the north; to the east flow the Sittang and Salween. All were serious military obstacles. Central Burma’s valleys – only passable to vehicles in the dry season – open into thickly wooded plains dotted with low hills. Hydrated flat land possessed peasant-cultivated rice paddies. South of Mandalay and Shwebo, arid terrain has sparse vegetation. The Pegu Yomas’ (mountains’) jungle hills lie between the Irrawaddy and Sittang rivers. The Arakan Yomas, rising to 3,000ft, separate Burma from the west coastal Arakan. In the monsoon season, the muddy fields are impassable to wheels or tracks and the chaungs or streams flood. Near the coast, the tracks are fringed with mangrove swamps, so watercraft is the only practical way of ferrying men and stores. In the Arakan, the steep razor-backed hills are covered in dense forest. The Tenasserim, comprising mainly tropical rainforest, is situated in southern Burma from the lower Salween to the Kra Isthmus near Thailand.
As for transportation routes (see Map 5), the major Rangoon to Mandalay railway ran north along the course of the Sittang River and continued north through Shwebo, Wuntho, Indaw and Mogaung, then on to its terminus at Myitkyina. At Mandalay, the railway branched east through Maymyo to Lashio, then reaching the Burma Road. There were two shorter railway branches east of the Irrawaddy River: the first through Meiktila to Myingyan, and the second from Pyinmana north-west to Kyaukpadaung. Another railway branch started north-east of Rangoon and then turned south-easterly through Moulmein and the Tenasserim crossing into Thailand. A fourth railway branch from Rangoon paralleled the Irrawaddy River’s eastern side and ran north-west to Prome.
Map 1. Situation after Japan’s Invasion of Burma, January–May 1942.
1 On 15 January 1942, the IJA 33rd and 55th divisions from Thailand invade Burma’s Tenasserim, the strip of southern Burma in the Kra Isthmus and seize airfields at Mergui and Tavoy to bomb Rangoon’s port and British convoys. Moulmein, at the Salween River’s junction with the Andaman Sea, fell on 30 January. During February, the IJA 33rd and 55th divisions drive westwards towards Rangoon, passing through the Allied Salween and Bilin River lines. 2 On 22–23 February, the IJA 33rd and 55th Divisions defeat the 17th Indian Division at the Battle of the Sittang Bridge, south of Toungoo, on 22–23 February. A premature Allied demolition of the Sittang River’s bridge on 23 February strands two 17th Division brigades and vehicles on the river’s eastern bank, leaving Rangoon open for the IJA. 3 On 5 March, Lieutenant General Sir Harold Alexander, new C-in-C Burma, realizes that Rangoon cannot hold against the IJA 33rd and 55th divisions moving overland through Pegu with the port’s oil refineries seized by a Japanese Commando seaborne attack. Alexander’s Rangoon garrison retreats north up the Prome Road through the Irrawaddy Valley to protect the oilfields at Yenangyaung. On 8 March, the IJA 33rd Division enters a deserted Rangoon with the IJA 18th and 56th divisions landing by sea. 4 In mid-March, a reinforced IJA 33rd Division drives north towards Prome. On 19 March, BurCorps, comprising the remnants of the 17th Indian and 1st Burma divisions with the attached 7th Armoured Brigade under Lieutenant General William Slim defends Prome, but crumbles under a Japanese attack on 1–2 April, forcing a withdrawal. Within days, the IJA 33rd Division captures Yenangyaung’s oilfields after Slim ordered their destruction on 15 April before retreating. Although the 1st Burma Division was broken as a fighting force at Yenangyaung, General Sun Li-jen’s 38th Chinese Division briefly counterattacked on 20 April inflicting many Japanese casualties, but Slim called off the counterattack. 5 The IJA 55th Division continuing its advance north on to Mandalay attacks the 200th Chinese Division at Toungoo from 24–30 March. The Japanese entered Toungoo on 1 April. 6 The IJA 56th Division with armour envelops the Chinese flank at Taunggyi and advances north through the Shan States to sever roads to Yunnan Province to prevent Chiang’s armies in Burma from retreating. Stilwell’s Chinese 200th Division counterattacks the IJA 56th Division on 23–24 April, recapturing Taunggyi to allow the Chinese 5th Army to escape northwards. 7 The IJA 56th Division resumes its northward advance and occupies Lashio on 29 April to sever the Burma Road as resistance from the Chinese 6th Army’s 55th and 93rd divisions collapses. 8 On 23 April, Alexander orders Chinese forces east of the Mandalay railway to withdraw north-east to defend the road through Lashio, while directing Slim’s BurCorps plus Sun’s 38th Chinese Division to cross the Irrawaddy at Shweb on 25 April so as not to get trapped by a defence of Mandalay. 9 In early May, after the fall of Mandalay and Monywa, Slim’s BurCorps and Sun’s 38th Chinese Division continue retreating west to the Chindwin River to cross into India near Tamu. Myitkyina is captured by IJA forces on 8 May 1942. 10 In early May, Stilwell tries to re-establish contact with the retreating Chinese troops, but while at Indaw learns that the Japanese blocked the railway to Myitkyina. So he leads a group of more than 100 soldiers and Burmese nurses westwards to get to the Chindwin River. This ‘Walkout’ commenced on 6 May with Stilwell crossing the river at Homalin and reaching Imphal on 20 May with Japanese columns in pursuit.11 The Chinese 22nd Division retreats from the Myitkyina area back to Ledo, India. Other Chinese divisions – the 55th, 93rd, 96th and 200th – retreat to the north-east into China. 12 Akyab Island on the Arakan coast is captured by the Japanese on 4 May. 13 Kalewa, near the Indo Burmese border, is captured by IJA forces on 14 May. The Japanese occupation of Burma is near-complete except for a British garrison at Fort Hertz in the far north from which British-led Kachin rebels clash with patrols of the IJA 18th Division’s 114th IR garrisoning Myitkyina near Sumprabum.
The Rangoon-Mandalay motor road moved north-eastward to connect with Lashio and the Burma Road, which was the main LOC for the United States to supply the Chinese, who were fighting the Japanese for most of the 1930s. From Mandalay, an all-weather road paralleled the railway to Myitkyina through Shwebo, Wuntho and Indaw. Non-all-weather roads emanated north from Myitkyina to Sumprabum and south-west to Mogaung. There were many minor roads throughout but, like the Kamaing Road in the Hukawng and Mogaung valleys, they were no more than dirt tracks.
Japanese Invasion of Burma
Japan’s Burmese invasion from eastern Thailand started a week after their Pearl Harbor attack as IJA units captured Victoria Point’s airfield on Burma’s southern tip. By mid-January 1942, the Japanese had seized other airfields at Mergui and Tavoy in the Tenasserim. The IJA 15th Army’s 33rd and 55th divisions waited along the Thai border until Malayan operations were nearing completion to begin the major Burmese invasion on 20 January. Rangoon, Burma’s capital and major port, Prome and Toungoo, the Yenangyaung oilfields, and Mandalay, central Burma’s major city were Japan’s principal objectives. On 18–19 April, the IJA 33rd Division drove into the oilfields at Yenangyaung as the British attempted to destroy them. The inglorious Allied retreat throughout Burma was now in full throttle, enabling the IJA to capture the entire country within weeks as Japanese troops were on both banks of the Chindwin River on 27 April, leaving eastern India in precarious straits. A divided Japanese high command rejected a plan to invade Assam, one of India’s north-eastern provinces, as being logistically impractical. The Burmese conquest was complete at a cost of 4,597 Japanese killed and wounded.
China’s supply line for almost a decade of combat with the IJA was through Rangoon and a railroad link via Mandalay with the Chinese frontier at Wanting. From there a fair-weather track to Kunming and Chungking was built in 1938 by 200,000 labourers. With Rangoon occupied and the Burma Road severed by the IJA, the Allies would now have to supply Chiang Kai-shek’s forces via an air-transport route over the Himalayan Mountains, ‘the Hump’, to keep them fighting the Japanese.
The Allies in Burma, 1941–42
Britain’s military presence in Burma was to protect north-eastern India’s industrial areas and maintain the overland route with China, the ‘Burma Road’. Britain’s Indian army troops in Burma at the onset of hostilities were only the 1st Burma Division and the 13th Indian Brigade. Fearing a Japanese attack from Thailand, the 16th and 46th Indian infantry and the 17th Indian Division arrived to bolster the defences. These formations lacked jungle experience. The 17th Indian Division was previously trained for North Africa and as it was of better quality than the 1st Burma Division, it held the Salween River line covering Rangoon.
The swift Japanese south-east Burma advance overran the Salween and Bilin River lines to confront Britain’s new Sittang River defences. These Allied defensive positions were soon in near collapse, so a withdrawal across the river was issued for 23 February 1942; however, a premature detonation of explosives destroyed the bridge, stranding many British-Indian troops and vehicles on the river’s eastern side. Rangoon’s evacuation was imminent with General Sir Harold Alexander’s arrival on 5 March to assume the Burma army command. Alexander ordered the British-Indian garrison to leave Rangoon for Prome on 6 March, destroying many important sites before the IJA entry on 8 March.
The 5th, 6th and 66th Chinese armies (each equalling a British division) moved into Burma from Yunnan Province during February–April 1942 to stem the Japanese advance. Chiang Kai-shek placed Lieutenant General Joseph W. Stilwell (sent to China by President Roosevelt) as an independent commander of these Chinese forces. Stilwell arrived at Lashio on 14 March after meeting the generalissimo on 6 March at Maymyo. Stilwell contemplated a counteroffensive; however, that plan disintegrated when the Chinese failed to stop the Japanese at Toungoo after a ten-day stand.
Alexander realized that his weakened forces could not defend the Mandalay-Lashio road (the major link with China), as well as Mandalay proper and the Yenangyaung oilfields. To retard Burma’s complete capitulation to the Japanese, British and Indian forces designated ‘Burcorps’ comprising the 17th Indian and the 1st Burma divisions’ remnants along with the 7th Armoured Brigade were placed under Lieutenant General William J. Slim on 19 March. Slim’s defensive line at Prome was attacked by the IJA on 1–2 April, forcing an Allied withdrawal on 2 April. Simultaneously, the Japanese advanced north from Rangoon to Mandalay. On 3 April Slim ordered a defence of the Yenangyaung oilfields north of Prome, but these fell to the Japanese on 18–19 April.
On 18 April Field Marshal Archibald Wavell, C-in-C India, ordered Alexander to prepare for a withdrawal from Burma starting with the majority of British-Indian troops in Mandalay to begin crossing the Irrawaddy River on 25–26 April for their retreat to the Chindwin River and Assam. Alexander’s forces withdrew towards Kalewa, which Wavell stocked with supplies before the monsoon’s start on 15 May. The last British-Indian troops left Burma on 20 May, as Alexander’s command ended after a 1,000-mile retreat with his forces suffering 10,036 casualties, of which 3,670 were killed and wounded and the remaining 6,366 missing.
Chiang’s ground and American volunteer air forces combating the Japanese were isolated from resupply both by sea through Rangoon and overland across the Burma Road, located south of Myitkyina, and now relied on the treacherous Himalayan Mountain air supply route (‘the Hump’) from the air depots in India’s north-eastern provinces of Assam and Manipur to the Chinese south-western province of Yunnan due to terrain, bad weather, unreliable C-46 and C-47 transport aircraft and Japanese fighter sorties from the now IJA-occupied Myitkyina airfields.
Japanese Plans
In September 1942, Lieutenant General Renya Mutaguchi, commander of the IJA 18th Division, told Lieutenant General Shōjirō Iida, the commander of the IJA 15th Army, that northern Burma’s jungles and mountainous terrain prevented his division from being supplied for a tentative IJA 15th Army invasion of Assam and seizure of air depots there that were supplying the Chinese via ‘the Hump’ air supply route. By early 1943, only skeleton forces of the IJA 18th and 33rd divisions simply garrisoned northern Burma and the Chindwin River.
In February 1943, ‘Chindit’ commander Brigadier Orde Wingate (see below for details) with his 77th Brigade’s LRP columns during Operation LONGCLOTH demonstrated to Mutaguchi that a large force could cross the Naga Hills and