| Burma Campaign | |||||||
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| Part of the Pacific War during World War II | |||||||
The scene on Scraggy Hill, captured by the 10th Gurkhas during the Battle of Impha |
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| Belligerents | |||||||
| Allies: United Kingdom |
Axis: Empire of Japan |
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| Commanders and leaders | |||||||
| Archibald Wavell Louis Mountbatten William Slim Luo Zhuoying Wei Lihuang Joseph Stilwell Aung San (from 27 March 1945) |
Shōjirō Iida Masakazu Kawabe Hyotaro Kimura Renya Mutaguchi Aung San (until 27 March 1945) Subhas C. Bose Jarun Rattanakuln Seriroengrit |
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| Strength | |||||||
| 60,000(1941)1 42,000 (1942)1; 100,000 (1944)2 |
316,700 (1944)[1] 43,000 (1945) 35,000 |
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| Casualties and losses | |||||||
| 71,244 killed and wounded[2] | 144,000 killed; possibly another 70,000 wounded. Total: ~200,000.3 | ||||||
| 1 Chinese Expeditionary Force in Burma. 2 The X Force and Y Force. 3 Japanese Army |
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The Burma Campaign in the South-East Asian Theatre of World War II was fought primarily between British Commonwealth, Chinese and United States forces against the forces of the Empire of Japan, Thailand, and the Indian National Army. British Commonwealth land forces were drawn primarily from British India. The Burmese Independence Army initially fought for the Japanese though they later switched sides.
The campaign had a number of notable features. The geographical characteristics of the region meant that factors like weather, disease and terrain had a major effect on operations. The lack of transport infrastructure placed an emphasis on military engineering and air transport to move and supply troops, and evacuate wounded. The campaign was also politically complex, with the British, Americans and Chinese all having different strategic priorities.
The climate of the region is dominated by the seasonal monsoon rains, which allowed effective campaigning for only just over half of each year. This, together with other factors such as famine and disorder in British India and the priority given by the Allies to the defeat of Nazi Germany, prolonged the campaign and divided it into four phases: the Japanese invasion which led to the expulsion of British, Indian and Chinese forces in 1942; failed attempts by the Allies to mount offensives into Burma, from late 1942 to early 1944; the Japanese invasion of India which ultimately failed following the battles of Imphal and Kohima; and, finally, the successful Allied offensive which reoccupied Burma from late-1944 to mid-1945.
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Japanese objectives in Burma were initially limited to the capture of Rangoon, the capital and principal seaport. This would close the overland supply line to China and provide a strategic bulwark to defend Japanese gains in Malaya and the Dutch East Indies. The Japanese Fifteenth Army under Lieutenant General Shojiro Iida, initially consisting of only two infantry divisions, moved into northern Thailand (which had signed a treaty of friendship with Japan), and launched an attack over jungle-clad mountain ranges into the southern Burmese province of Tenasserim in January 1942.
The Japanese successfully attacked over the Kawkareik Pass, and captured the port of Moulmein at the mouth of the Salween River after overcoming stiff resistance. They then advanced northwards, outflanking successive British defensive positions. Troops of the 17th Indian Division tried to retreat over the Sittang River, but Japanese parties reached the vital bridge before they did. On 22 February, the bridge was demolished to prevent its capture, a decision that has since been extremely contentious.
The loss of two brigades of 17th Indian Division meant that Rangoon could not be defended. General Archibald Wavell, the commander-in-chief of the ABDA Command, nevertheless ordered Rangoon to be held as he was expecting substantial reinforcements from the Middle East. Although some units arrived, counterattacks failed and the new commander of Burma Army (General Harold Alexander), ordered the city to be evacuated on 7 March after its port and oil refinery had been destroyed. The remnants of Burma Army broke out to the north, narrowly escaping encirclement.
After the fall of Rangoon, the Allies attempted to make a stand in the north of the country (Upper Burma), having been reinforced by a Chinese Expeditionary Force in Burma. The Japanese had also been reinforced by two divisions made available by the capture of Singapore, and defeated both the newly organised Burma Corps and the Chinese force. The Allies were also faced with growing numbers of Burmese insurgents and the civil administration broke down in the areas they still held. With their forces cut off from almost all sources of supply, the Allied commanders finally decided to evacuate their forces from Burma.
The retreat was conducted in very difficult circumstances. Starving refugees, disorganised stragglers, and the sick and wounded clogged the primitive roads and tracks leading to India. Burma Corps managed to make it most of the way to Imphal, in Manipur in India just before the monsoon broke in May 1942, having lost most of their equipment and transport. There, they found themselves living out in the open under torrential rains in extremely unhealthy circumstances. The army and civil authorities in India were very slow to respond to the needs of the troops and civilian refugees.
Due to lack of communication, when the British retreated from Burma, almost none of the Chinese knew about the retreat. Realising that they could not win without British support, some of the Chinese troops committed by Chiang Kai-shek made a hasty and disorganised retreat to India where they were put under the command of the American General Joseph Stilwell. After recuperating they were re-equipped and retrained by American instructors, the rest of the Chinese troops tried to return to Yunnan through remote mountainous forests and out of these, at least half died.
A Thai military alliance with Japan had been signed on 21 December 1941. Three Thai infantry and one cavalry division, spearheaded by armoured reconnaissance groups and supported by the air force, started their advance into Burma on 10 May, and engaged the retreating Chinese 93rd Division. Kengtung, the main objective, was captured on 27 May. Renewed offensives in June and November drove the Chinese back into Yunnan.
The boundary between the Japanese and Thai operations was generally the Salween. However, that area south of the Shan States known as Karenni States, the homeland of the Karens, was specifically retained under Japanese control.
The Japanese did not renew their offensive after the monsoon ended. They installed a nominally independent Burmese government under Ba Maw, and reformed the Burma Independence Army on a more regular basis as the Burma National Army under Aung San. In practice, both government and army were strictly controlled by the Japanese authorities.
On the Allied side, operations in Burma over the remainder of 1942 and in 1943 were a study of military frustration. Britain could only maintain three active campaigns, and immediate offensives in both the Middle East and Far East proved impossible through lack of resources. The Middle East was accorded priority, being closer to home and in accordance with the "Germany First" policy in London and Washington.
The Allied build up was also hampered by the disordered state of Eastern India at the time. There were violent "Quit India" protests in Bengal and Bihar,[3] which required large numbers of British troops to suppress. There was also a disastrous famine in Bengal, which may have led to 3 million deaths through starvation, disease and exposure. In such conditions of chaos, it was difficult to improve the inadequate lines of communication to the front line in Assam or make use of local industries for the war effort. Efforts to improve the training of Allied troops took time and in forward areas poor morale and endemic disease combined to reduce the strength and effectiveness of the fighting units.
Nevertheless, the Allies mounted two operations during the 1942–1943 dry season. The first was a small offensive into the coastal Arakan region of Burma. The Indian "Eastern Army" intended to reoccupy the Mayu peninsula and Akyab Island, which had an important airfield. A division advanced to Donbaik, only a few miles from the end of the peninsula but was halted by a small but well entrenched Japanese force. At this stage of the war, the Allies lacked the means and tactical ability to overcome strongly constructed Japanese bunkers. Repeated British and Indian attacks failed with heavy casualties. Japanese reinforcements arrived from Central Burma and crossed rivers and mountain ranges which the Allies had declared to be impassable, to hit the Allies' exposed left flank and overrun several units. The exhausted British were unable to hold any defensive lines and were forced to abandon much equipment and fall back almost to the Indian frontier.
The second action was controversial. Under the command of Brigadier Orde Wingate, a long-range penetration unit known as the Chindits infiltrated through the Japanese front lines and marched deep into Burma, with the initial aim of cutting the main north-south railway in Burma in an operation codenamed Operation Longcloth. Some 3,000 men entered Burma in many columns. They damaged communications of the Japanese in northern Burma, cutting the railway for possibly two weeks but they suffered heavy casualties. Though the results were questioned the operation was used to propaganda effect, particularly to insist that British and Indian soldiers could live, move and fight as effectively as the Japanese in the jungle, doing much to restore morale among Allied troops.
From December 1943 to November 1944 the strategic balance of the Burma campaign shifted decisively. Improvements in Allied leadership, training and logistics, together with greater firepower and growing Allied air superiority, gave Allied forces a confidence they had previously lacked. In the Arakan, XV Indian Corps withstood, and then broke, a Japanese counterstroke, while the Japanese invasion of India resulted in unbearably heavy losses and the ejection of the Japanese back beyond the Chindwin.
In August 1943 the Allies created South East Asia Command (SEAC), a new combined command responsible for the South-East Asian Theatre, under Admiral Lord Louis Mountbatten. The training, equipment, health and morale of Allied troops under British Fourteenth Army under Lieutenant General William Slim was improving, as was the capacity of the lines of communication in North-eastern India. An innovation was the extensive use of aircraft to transport and supply troops.
SEAC had to accommodate several rival plans, many of which had to be dropped for lack of resources. Amphibious landings on the Andaman Islands (Operation "Pigstick") and in Arakan were abandoned when the landing craft assigned were recalled to Europe in preparation for the Normandy Landings.
The major effort was intended to be by American-trained Chinese troops of Northern Combat Area Command under General Joseph Stilwell, to cover the construction of the Ledo Road. Orde Wingate had controversially gained approval for a greatly expanded Chindit force, which was given the task of assisting Stilwell by disrupting the Japanese lines of supply to the northern front. Chiang Kai-shek had also agreed reluctantly to mount an offensive from the Yunnan.
Under British Fourteenth Army, XV Corps prepared to renew the advance in Arakan province, while IV Corps launched a tentative advance from Imphal in the centre of the long front to distract Japanese attention from the other offensives.
About the same time that SEAC was established, the Japanese created Burma Area Army under Lieutenant General Masakazu Kawabe, which took under command the Fifteenth Army and the newly-formed Twenty-Eighth Army.
The new commander of Fifteenth Army, Lieutenant General Renya Mutaguchi was keen to mount an offensive against India. Burma Area Army originally quashed this idea, but found that their superiors at Southern Expeditionary Army Group HQ in Singapore were keen on it. When the staff at Southern Expeditionary Army were persuaded that the plan was inherently risky, they in turn found that Imperial General Headquarters in Tokyo was in favour of Mutaguchi's plan.
The Japanese were influenced to an unknown degree by Subhas Chandra Bose, commander of the Indian National Army. This was composed largely of Indian soldiers who had been captured in Malaya or Singapore, and Indians (Tamils) living in Malaya. At Bose's instigation, a substantial contingent of the INA joined in this Chalo Delhi ("March on Delhi"). Both Bose and Mutaguchi emphasised the advantages which would be gained by a successful attack into India. With misgivings on the part of several of Mutaguchi's superiors and subordinates, Operation U-Go was launched.[4]
Stilwell's forces (designated X Force) initially consisted of two American-equipped Chinese divisions with a Chinese-manned M3 Light Tank battalion and an American long-range penetration brigade known as "Merrill's Marauders".
In October 1943 the Chinese 38th Division (led by Sun Li-jen) began to advance from Ledo towards Myitkyina and Mogaung while American engineers and Indian labourers extended the Ledo Road behind them. The Japanese 18th Division was repeatedly outflanked by the Marauders and threatened with encirclement.
In Operation Thursday the Chindits were to support Stilwell by interdicting Japanese communications in the region of Indaw. A brigade began marching across the Patkai mountains on 5 February 1944. In early March three other brigades were flown into landing zones behind Japanese lines by the Royal Air Force and the USAAF established defensive strongholds around Indaw.
Meanwhile, the Chinese forces on the Yunnan front (Y Force) mounted an attack starting in the second half of April, with nearly 40,000 troops crossing the Salween river on a 300 kilometres (190 mi) front. Soon some twelve Chinese divisions of 72,000 men, under General Wei Lihuang, were attacking the Japanese 56th Division. The Japanese forces in the North were now fighting on two fronts in northern Burma.
On 17 May, control of the Chindits passed from Slim to Stilwell. The Chindits now moved from the Japanese rear areas to new bases closer to Stilwell's front, and were given additional tasks by Stilwell for which they were not equipped. They achieved several objectives, but at the cost of heavy casualties. By the end of June, they had linked up with Stilwell's forces but were exhausted, and were withdrawn to India.
Also on 17 May, a force of two Chinese regiments, Unit Galahad (Merrill's Marauders) and kachin guerillas captured the airfield at Myitkyina.[5] The Allies did not immediately follow up this success and the Japanese were able to reinforce the town, which fell only after a siege which lasted until 3 August. The capture of Myitkyina airfield nevertheless immediately helped secure the air link from India to Chungking in China over the Hump.
By the end of May the Yunnan offensive, though hampered by the monsoon rains and lack of air support, succeeded in annihilating the garrison of Tengchung and eventually reached as far as Lungling. Strong Japanese reinforcements then counter-attacked and halted the Chinese advance.
In Arakan, Indian XV Corps under Lieutenant General Philip Christison renewed the advance on the Mayu peninsula. Ranges of steep hills channeled the advance into three attacks each by an Indian or West African division. The 5th Indian Infantry Division captured the small port of Maungdaw on 9 January 1944. The Corps then prepared to capture two railway tunnels linking Maungdaw with the Kalapanzin valley but the Japanese struck first. A strong force from the Japanese 55th Division infiltrated Allied lines to attack the 7th Indian Infantry Division from the rear, overrunning the divisional HQ.
Unlike previous occasions on which this had happened, the Allied forces stood firm against the attack and supplies were dropped to them by parachute. In the Battle of the Admin Box from 5 February to 23 February, the Japanese concentrated on XV Corps' Administrative Area, defended mainly by line of communication troops but they were unable to deal with tanks supporting the defenders, while troops from 5th Indian Division broke through the Ngakyedauk Pass to relieve the defenders of the box. Although battle casualties were approximately equal, the result was a heavy Japanese defeat. Their infiltration and encirclement tactics had failed to panic Allied troops and as the Japanese were unable to capture enemy supplies, they starved.
Over the next few weeks, XV Corps' offensive ended as the Allies concentrated on the Central Front. After capturing the railway tunnels, XV Corps halted during the monsoon.
IV Corps, under Lieutenant-General Geoffrey Scoones, had pushed forward two divisions to the Chindwin River. One division was in reserve at Imphal. There were indications that a major Japanese offensive was building. Slim and Scoones planned to withdraw and force the Japanese to fight with their logistics stretched beyond the limit. However, they misjudged the date on which the Japanese were to attack, and the strength they would use against some objectives.
The Japanese Fifteenth Army consisted of three infantry divisions and a brigade-sized detachment ("Yamamoto Force"), and initially a regiment from the Indian National Army. Mutaguchi, the Army commander, planned to cut off and destroy the forward divisions of IV Corps before capturing Imphal, while the Japanese 31st Division isolated Imphal by capturing Kohima. Mutaguchi intended to exploit the capture of Imphal by capturing the strategic city of Dimapur, in the Brahmaputra River valley. If this could be achieved, the lines of communication to General Stilwell's forces and the airbases used to supply the Chinese over the Hump would be cut.
The Japanese troops crossed the Chindwin River on 8 March. Scoones (and Slim) were slow to order their forward troops to withdraw and the 17th Indian Infantry Division was cut off at Tiddim. It fought its way back to Imphal with aid from Scoones's reserve division, supplied by parachute drops. North of Imphal, 50th Indian Parachute Brigade was defeated at Sangshak by a regiment from the Japanese 31st Division on its way to Kohima. Imphal was thus left vulnerable to an attack by the Japanese 15th Division from the north but because the diversionary attack launched by Japanese in Arakan had already been defeated, Slim was able to move the 5th Indian Division by air to the Central Front. Two brigades went to Imphal, the other went to Dimapur from where it sent a detachment to Kohima.
By the end of the first week in April, IV Corps had concentrated in the Imphal plain. The Japanese launched several offensives during the month, which were repulsed. At the start of May, Slim and Scoones began a counter-offensive against the Japanese 15th Division north of Imphal. Progress was slow, as movement was made difficult by monsoon rains and IV Corps was short of supplies.
Also at the beginning of April, the Japanese 31st Division under Lieutenant-General Kotoku Sato reached Kohima. Instead of isolating the small British garrison there and pressing on with his main force to Dimapur, Sato chose to capture the hill station. The siege lasted from 5 April to 18 April, when the exhausted defenders were relieved. A new formation HQ, the Indian XXXIII Corps under Lieutenant-General Montagu Stopford, now took over operations on this front. The 2nd British Infantry Division began a counter-offensive and by 15 May, they had prised the Japanese off Kohima Ridge itself. After a pause during which more Allied reinforcements arrived, XXXIII Corps renewed its offensive.
By now, the Japanese were at the end of their endurance. Their troops (particularly 15th and 31st Divisions) were starving, and during the monsoon, disease rapidly spread among them. Lieutenant-General Sato had notified Mutaguchi that his division would withdraw from Kohima at the end of May if it were not supplied. In spite of orders to hold on, Sato did indeed retreat. The leading troops of IV Corps and XXXIII Corps met at Milestone 109 on the Dimapur-Imphal road on 22 June, and the siege of Imphal was raised.
Mutaguchi (and Kawabe) continued to order renewed attacks. 33rd Division and Yamamoto Force made repeated efforts, but by the end of June they had suffered so many casualties both from battle and disease that they were unable to make any progress. The Imphal operation was finally broken off early in July, and the Japanese retreated painfully to the Chindwin River.
It was the greatest defeat to that date in Japanese history. They had suffered 55,000 casualties, including 13,500 dead. Most of these losses were the result of disease, malnutrition and exhaustion. The Allies suffered 17,500 casualties. Mutaguchi had already relieved all his divisions' commanders; he was subsequently relieved of command himself.
During the monsoon from August to November, Fourteenth Army pursued the Japanese to the Chindwin River. While the 11th East Africa Division advanced down the Kabaw Valley from Tamu, the 5th Indian Division advanced along the mountainous Tiddim road. By the end of November, Kalewa had been recaptured, and several bridgeheads were established on the east bank of the Chindwin.
The Allies launched a series of offensive operations into Burma during late 1944 and the first half of 1945. The command on the front was rearranged in November 1944. Eleventh Army Group HQ was replaced by Allied Land Forces South East Asia and NCAC and XV Corps were placed directly under this new headquarters. Although the Allies were still attempting to complete the Ledo Road, it was apparent that it would not materially affect the course of the war in China.
The Japanese also made major changes in their command. The most important was the replacement of General Kawabe at Burma Area Army by Hyotaro Kimura. Kimura threw Allied plans into confusion by refusing to fight at the Chindwin River. Recognising that most of his formations were weak and short of equipment, he withdrew his forces behind the Irrawaddy River, forcing the Allies to greatly extend their lines of communication.
In Arakan, XV Corps resumed its advance on Akyab Island for the third year in succession. This time the Japanese were far weaker, and retreated before the steady Allied advance. They evacuated Akyab Island on 31 December 1944. It was occupied by XV Corps without resistance on 3 January 1945 as part of Operation Talon, the amphibious landing at Akyab.
Landing craft had now reached the theatre, and XV Corps launched amphibious attacks on the Myebon Peninsula on 12 January 1945, and at Kangaw ten days later, to cut off the retreating Japanese. There was severe fighting until the end of the month, in which the Japanese suffered heavy casualties.
An important objective for XV Corps was the capture of Ramree Island and Cheduba Island, to construct airfields which would support the Allies' operations in Central Burma. There was severe fighting on Ramree, in which most of the Japanese garrison died. XV Corps operations on the mainland were curtailed to release transport aircraft to support Fourteenth Army.
NCAC resumed its advance late in 1944, although it was progressively weakened by the flyout of Chinese troops to the main front in China. On 10 December 1944, the 36th British Infantry Division on NCAC's right flank made contact with units of Fourteenth Army near Indaw in Northern Burma. Five days later, Chinese troops on the command's left flank captured the city of Bhamo.
NCAC made contact with Chiang's Yunnan armies on 21 January 1945, and the Ledo road could finally be completed, although by this point in the war its value was uncertain. Chiang ordered the American General Sultan, commanding NCAC, to halt his advance at Lashio, which was captured on 7 March. This was a blow to British plans as it endangered the prospects of reaching Rangoon before the onset of the monsoon, expected at the beginning of May. Winston Churchill, British Prime Minister, appealed directly to American chief of staff George Marshall for the transport aircraft which had been assigned to NCAC to remain in Burma.[6] From 1 April, NCAC's operations stopped, and its units returned to China and India. A US-led guerrilla force, OSS Detachment 101, took over the remaining military responsibilities of NCAC.
Fourteenth Army, now consisting of IV Corps and XXXIII Corps, made the main offensive effort into Burma. Although the Japanese retreat over the Irrawaddy forced the Allies to completely change their plans, such was the Allies' material superiority that this was done. IV Corps was switched in secret from the right to the left flank of the army and aimed to cross the Irrawaddy near Pakokku and seize the Japanese line-of-communication centre of Meiktila, while XXXIII Corps continued to advance on Mandalay.
During January and February, 1945, XXXIII Corps seized crossings over the Irrawaddy River near Mandalay. There was heavy fighting, which attracted Japanese reserves and fixed their attention. Late in February the 7th Indian Division leading IV Corps, seized crossings at Nyaungu near Pakokku. 17th Indian Division and 255th Indian Armoured Brigade followed them across and struck for Meiktila. In the open terrain of Central Burma, this force outmanoeuvered the Japanese and fell on Meiktila on 1 March. The town was captured in four days, despite resistance to the last man.
The Japanese tried first to relieve the garrison at Meiktila and then to recapture the town and destroy its defenders. Their attacks were not properly coordinated and were repulsed. By the end of March the Japanese had suffered heavy casualties and lost most of their artillery, their chief anti-tank weapon. They broke off the attack and retreated to Pyawbwe.
XXXIII Corps had renewed its attack on Mandalay. It fell to 19th Indian Division on 20 March, though the Japanese held the former citadel which the British called Fort Dufferin for another week. Much of the historically and culturally significant portions of Mandalay were burned to the ground.
Though the Allied force had advanced successfully into central Burma, it was vital to capture the port of Rangoon before the monsoon to avoid a logistics crisis. In the spring of 1945, the other factor in the race for Rangoon was the years of preparation by the liaison organisation, Force 136, which resulted in a national uprising within Burma and the defection of the entire Burma National Army to the allied side. In addition to the allied advance, the Japanese now faced open rebellion behind their lines.
XXXIII Corps mounted Fourteenth Army's secondary drive down the Irrawaddy River valley against stiff resistance from the Japanese Twenty-Eighth Army. IV Corps made the main attack, down the "Railway Valley", which was also followed by the Sittang River. They began by striking at a Japanese delaying position (held by the remnants of the Japanese Thirty-Third Army) at Pyawbwe. The attackers were initially halted by a strong defensive position behind a dry chaung, but a flanking move by tanks and mechanized infantry struck the Japanese from the rear and shattered them.
From this point, the advance down the main road to Rangoon faced little organised opposition. An uprising by Karen guerillas prevented troops from the reorganised Japanese Fifteenth Army reaching the major road centre of Toungoo before IV Corps captured it. The leading Allied troops met Japanese rearguards north of Pegu, 40 miles (64 km) north of Rangoon, on 25 April. Kimura had formed the various service troops, naval personnel and even Japanese civilians in Rangoon into the 105 Independent Mixed Brigade. This scratch formation held up the British advance until April 30 and covered the evacuation of the Rangoon area.
The original conception of the plan to re-take Burma had envisaged XV Corps making an amphibious assault on Rangoon well before Fourteenth Army reached the capital, in order to ease supply problems. This operation, codenamed Operation Dracula, was postponed several times as the necessary landing craft were retained in Europe and finally dropped in favour of an attack on Phuket Island, off the west coast of Thailand.
Slim feared that the Japanese would defend Rangoon to the last man through the monsoon, which would put Fourteenth Army in a disastrous supply situation. He therefore asked for Operation Dracula to be re-mounted at short notice. The naval forces for the attack on Phuket were diverted to Operation Dracula, and units of XV Corps were embarked from Akyab and Ramree.
On 1 May, a Gurkha parachute battalion was dropped on Elephant Point, and cleared Japanese rearguards from the mouth of the Rangoon River. The 26th Indian Infantry Division landed by ship the next day. When they arrived they discovered that Kimura had ordered Rangoon to be evacuated, starting on 22 April. After the Japanese withdrawal, Rangoon had experienced an orgy of looting and lawlessness similar to the last days of the British in the city in 1942. On the afternoon of 2 May 1945 the monsoon rains began in full force. The Allied drive to liberate Rangoon before the rains had succeeded with only a few hours to spare.
The leading troops of the 17th and 26th Indian divisions met at Hlegu, 28 miles (45 km) north of Rangoon, on 6 May.
Following the capture of Rangoon, a new Twelfth Army headquarters was created from XXXIII Corps HQ to take control of the formations which were to remain in Burma.
The Japanese Twenty-Eighth Army, after withdrawing from Arakan and resisting XXXIII Corps in the Irrawaddy valley, had retreated into the Pegu Yomas, a range of low jungle-covered hills between the Irrawaddy and Sittang rivers. They planned to break out and rejoin Burma Area Army. To cover this breakout, Kimura ordered Thirty-Third Army to mount a diversionary offensive across the Sittang, although the entire army could muster the strength of barely a regiment. On 3 July, they attacked British positions in the "Sittang Bend". On 10 July, after a battle for country which was almost entirely flooded, both the Japanese and the Allies withdrew.
The Japanese had attacked too early. Sakurai's Twenty-Eighth Army was not ready to start the breakout until 17 July. The breakout was a disaster. The British had placed ambushes or artillery concentrations on the routes the Japanese were to use. Hundreds of men drowned trying to cross the swollen Sittang on improvised bamboo floats and rafts. Burmese guerrillas and bandits killed stragglers east of the river. The breakout cost the Japanese nearly 10,000 men, half the strength of Twenty-Eighth Army. British and Indian casualties were minimal.
Fourteenth Army (now under Lieutenant General Miles Dempsey) and XV Corps had returned to India to plan the next stage of the campaign to re-take south east Asia. A new corps, the Indian XXXIV Corps, under Lieutenant-General Ouvry Lindfield Roberts was raised and assigned to Fourteenth Army for further operations.
This was to be an amphibious assault on the western side of Malaya codenamed Operation Zipper. The dropping of the atomic bombs forestalled this operation, but it was undertaken post-war as the quickest way of getting occupation troops into Malaya.
The military and political results of the Burma campaign have been contentious on the Allied side. In military terms, the Japanese retained control of Burma until the result of the campaign was irrelevant to the fate of Japan. It was recognised by many contemporary authorities and later historians that the campaign was a "sideshow" and (apart from distracting some Japanese land forces from China or the Pacific) did not contribute to the defeat of Japan, although the recovery of Burma was reckoned a triumph for the British Indian Army. After the war ended, a combination of the pre-war agitation among the Burman population for independence, the economic ruin of Burma during the four years' campaign and the military and political humiliation of the British far eastern empire during the Japanese invasions made it impossible for the former regime to be resumed. Within three years, both Burma and India were independent.
Against these criticisms, the attempted Japanese invasion of India in 1944 was launched on unrealistic premises and resulted in the greatest defeat the Japanese armies had suffered to that date. After the Singapore debacle and the loss of Burma in 1942, the British were bound to defend India at all costs, as a successful invasion by Japanese Imperial forces would have been disastrous. The defence operations at Kohima and Imphal in 1944 have since taken on huge symbolic value as the turning of the tide in British fortunes in the war in the East.
The American historian Raymond Callahan concluded "Slim's great victory ... helped the British, unlike the French, Dutch or, later, the Americans, to leave Asia with some dignity."[7]
American goals in Burma had been to aid the Nationalist Chinese regime. Apart from the "Hump" airlift, these bore no fruit until so near the end of the war that they made little contribution to the defeat of Japan. These efforts have also been criticised as fruitless because of the self-interest and corruption of Chiang Kai-Shek's regime.