Shortly after the Communist invasion of South Korea in June 1950, the battalion was ordered to prepare to mount out for the Far East. The first element of the battalion arrived in the war zone on 2 August 1950. Upon arrival, it disembarked at the port of Pusan and immediately commenced operations against the enemy. The battalion, with Company A now reattached also participated in the amphibious landing at Inchon on 15 September. The 1st Tank Battalion remained engaged with both North Korean and Chinese Communist forces for three years. Redeployment back to the United States finally came in 1955.