The Burma Campaign in the South-East Asian Theatre of World War II was fought primarily between British Commonwealth, Chinese and United States forces against the forces of the Empire of Japan, Thailand, the Burmese Independence Army and the Indian National Army. British Commonwealth land forces were drawn primarily from the United Kingdom, British India and Africa.The campaign had a number of notable features. The geographical characteristics of the region meant that factors like weather, disease and terrain had a major effect on operations. The lack of transport infrastructure placed an emphasis on military engineering and air transport to move and supply troops, and evacuate wounded. The campaign was also politically complex, with the British, Americans and Chinese all having different strategic priorities.