Burma Campaign - The Japanese Invasion of India 1944

The Japanese Invasion of India 1944

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.