The Burma Campaign was fought primarily between the British and Japanese empires for control of the British held colony. As the war progressed both sides received aid from other factions: Britain from the US and China and the Japanese from the Indian National Army. The campaign for Burma commenced in 1942 with a Japanese invasion of the territory. This initial phase lasted only a few months and resulted in the expulsion of the British from the region. Afterwards the British organized a few guerilla style incursions in the now occupied territory, but no major battles were fought until 1944 when a major Japanese offensive into India was stopped at the battles of Imphal and Kohima. Afterwards the tide of war shifted by a series of Allied forces advancements into Burma. The region was reoccupied by the Allies by mid 1945.