The Bloody Gulch massacre was a war crime that took place in the Korean War on August 12, 1950 in "Bloody Gulch", west of Masan, South Korea. After a very successful attack on two undefended US Artillery Battalions that killed or wounded hundreds of US troops, members of the North Korean People's Army (KPA) 13th Regiment executed seventy-five captured US Army prisoners of war during one of the smaller engagements of the Battle of Pusan Perimeter. The troops were from the 555th Field Artillery Battalion (24th Infantry Division) and the 90th Field Artillery Battalion (25th Infantry Division).