World War II Reaches India: Kohima and Imphal

Battles of Kohima and Imphal, 1944 — this is the newest and most geographically unusual addition to this chapter, and increasingly the subject of dedicated questions in both UPSC and state-level exams. As part of the Japanese Army's Operation U-Go, launched under Lieutenant General Renya Mutaguchi, Japanese forces invaded British India through the hill terrain of Manipur and Nagaland in early 1944, aiming to seize the road and rail hub at Imphal, cut off Allied supply lines into China via Burma, and — with the encouragement of Netaji Subhas Chandra Bose's Indian National Army (Azad Hind Fauj), which advanced alongside Japanese units under the slogan "Chalo Delhi" — spark a wider anti-British uprising inside India itself. The British and Indian troops of the Fourteenth Army, under General William Slim, held two simultaneous, mutually reinforcing sieges: at Kohima, a small garrison fought a desperate, close-quarters battle for weeks over the district commissioner's bungalow and its tennis court, famously fought across the width of the tennis court itself, before reinforcements broke the siege; at Imphal, a larger encircled force held out through the monsoon until relief columns fought their way through. Japanese troops, having advanced on inadequate supply lines through extremely difficult terrain, suffered catastrophic losses from starvation, disease, and monsoon flooding on top of combat casualties, and Mutaguchi's shattered army was forced into a disorganised retreat back into Burma. The Battle of Kohima has since been called "the Stalingrad of the East" by British military historians and was voted, in a 2013 National Army Museum poll, "Britain's Greatest Battle" — a title exam-writers enjoy citing. Its consequences were decisive for the rest of the war in Asia: it marked the largest single defeat inflicted on the Japanese Army up to that point in the war, ended any realistic Japanese or INA threat to British India, and opened the way for the Allied reconquest of Burma over the following year, effectively sealing the fate of Japan's mainland Asian campaign well before its final surrender in 1945.

Memory hook — "Kohima and Imphal: the twin gates that never opened." Kohima was the northern gate, Imphal the southern gate, both aimed at Delhi via the INA's "Chalo Delhi" call — neither gate opened, and the failure at both, fought in the same weeks of 1944, broke the last serious external military threat to India before Independence.

Practice Recall: Which side launched Operation U-Go, under which general, and which Indian nationalist force advanced alongside it? ... Answer: the Japanese Army, under Lieutenant General Renya Mutaguchi, alongside Subhas Chandra Bose's Indian National Army (Azad Hind Fauj).