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How did Japan plan to use Assam in British India during the Burma Campaign?

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Map showing the height of Japanese territorial expansion in 1942 during World War II, with a large hatched area covering much of East and Southeast Asia and the western Pacific, including parts of China, Korea, Southeast Asia, the Philippines, and numerous Pacific islands. Japan's home islands are shaded in solid red, while the expansion area stretches from India and Burma in the west to the Aleut — Burma Railway In World War II Japanese military forces quickly took advantage of their success at Pearl Harbor to expand their holdings throughout the Pacific and westward toward India. This expansion continued relatively unchecked until mid-1942. Then, after losing the Battle of Midway, Japan was forced on the defensive.

During the Burma Campaign of World War II, Japan viewed the occupation of the Indian region of Assam as a key strategic objective. The Japanese military intended to use Assam as a base to launch an insurrection against British rule in India, which would be led by the Japanese-backed Indian revolutionary Subhas Chandra Bose.1

To support these ambitions and their broader military offensives in the region, the Japanese constructed the Burma Railway to provide a direct overland supply route after sea-lanes became insecure. Later, in the dry season of 1943–44, Japanese forces planned a major advance across the Chindwin River to occupy the plain of Imphal and establish a firm defensive line within eastern Assam. However, these efforts were ultimately thwarted by Allied forces, whose defensive victories at Imphal and Kohima in 1944 were decisive in halting the Japanese advance into India.123