
Three M26 Pershing tanks founded in an ordnance depot in Japan were hurriedly rebuilt and sent to Korea. UN air strikes flying from Japan and carriers managed to destroy some of the NKPA armor but it was not enough to stop the invading army. Throughout the month of July, the UN forces withdrew under pressure and it became known as the “bug out” period.

The South Korean (ROK) units and the meager US forces were no match against the invading North Korean armor and infantry units. Elements of the US 24th Infantry Division on occupation duty in Japan were airlifted to Korea and M24 Chaffee light tanks based in Japan were hastily sent to Korea. On June 27, US President Truman ordered US forces to South Korea. 109th Tank Regiment (Numbers 300 to 339).


The battalion participated in the amphibious landing at Inchon, the liberation of South Korean capital Seoul and the amphibious landing at Wonsan where it advanced north supporting the Marines at the Chosin reservoir. Upon arrival, elements of the battalion disembarked at the port of Pusan and immediately went into combat where it was the first unit to engage and defeated the feared T-34 tank. Soon after the outbreak of the Korean War, the US 1st Marine Tank Battalion was one of the armored units ordered to prepare for a rapid deployment to Korea.
