"Battle of Masan"(Aug.5~Sept.19,1950) ,Pusan Perimeter , Korean War. Gen. Macarthur specially sent 1st Provisional Marine Brigade for future Inchon Landing Operation but Gen.Walker frequently used for many dangerous situations of "Pusan Perimeter"deffense as "Firefighters" at dangerous fronts ! They showed effective M-26 Pershing tanks -- Marine troops cooperative operations. after M-26 involvement,T-34/85 couldn't withstand on tank battles.! Photo--- 1st US Marine arrived.