Operation Dracula

Having invaded Thailand, the Japanese launched an attack on southern Burma in March 1942. The British, Indian and Burmese troops were outnumbered and forced to leave Rangoon, the capital of Burma. As a the Japanese troops kept pooring into Burma, the defense of the country became impossible and the British and Chinese forces left Burma and withdrew into India.

http://historywarsweapons.com/operation-dracula/