Battle of Pusan Perimeter
On the outbreak of the Korean War, Kouma commanded an M26 Pershing tank in the 2nd Infantry Division. While fighting during the Battle of Pusan Perimeter along the Naktong River, Kouma commanded his tank as it single-handedly fended off repeated North Korean attempts to cross the river after units around it had withdrawn. Wounded twice, Kouma killed 250 North Korean troops in this action.