Japanese conquest of Burma main attack westward from Rahaeng in Thailand across the Kawkareik Pass. The 16th Indian Infantry Brigade of the 17th Indian Division guarding this approach retreated hastily westward. The Japanese division advanced to Moulmein at the mouth of the Salween River which was garrisoned by the 2nd Burma Infantry Brigade. The position was almost impossible to defend, and had the River Salween, almost wide, behind it. The 2nd Burma Brigade was squeezed into a progressively tighter perimeter, and eventually retreated over the river by ferry on 31 January after abandoning a large amount of supplies and equipment. Part of the force
State of Burma quickly collapsed, and Ba Maw fled via Thailand to Japan, where he was captured later that year and was held in Sugamo Prison, Tokyo, until 1946. State of Burma The State of Burma () was a puppet state of the Empire of Japan, created in 1943 during the Japanese occupation of Burma in World War II. During the early stages of World War II, the Empire of Japan invaded British Burma primarily to obtain raw materials (which included oil from fields around Yenangyaung, minerals and large surpluses of rice), and to close off the Burma Road, which was a primary