The Chinese Expeditionary Force was an expeditionary unit of China's National Revolutionary Army that was dispatched to Burma and India in support of the Allied efforts against the Imperial Japanese Army during the Japanese invasion and occupation of Burma in the South-East Asian theatre of the Second World War.

Sun Li-jen was a Chinese Nationalist (KMT) general, a graduate of Virginia Military Institute in the United States, best known for his leadership in the Second Sino-Japanese War and the Chinese Civil War. His military achievements earned him the laudatory nickname "Rommel of the East". His New First Army was known as the "Best Army under heaven" and credited with effectively confronting Japanese troops in the 1937 Battle of Shanghai and in the Burma Campaign, 1943–1944.