The arrival of the 1st Provisional Marine Brigade in August 1950 bolstered the U.S. and South Korean forces in the Pusan perimeter. The North Korean army was stalled in their offensive attempts to overrun the perimeter and virtually end the war. The North Korean army out ran its supply lines and the U.S. forces staged a counter attack beginning with the push into the Chinju-Masan Corridor and with the 5th Marines stand at the Naktong River and the battles for the Namji-ri Bridge and Obongni Ridge.