By 1 September, the 1st Provisional Marine Brigade was down to 4,290 men, having suffered 500 casualties in its month of Korean service, and was preparing to move back to Pusan to evacuate to Japan. There, the brigade was to join with Marine reinforcements to re-form the 1st Marine Division, which would then be a part of X Corps for a counterattack at Inchon. However, the North Korean Great Naktong Offensive delayed these plans, as the brigade was needed to repel one more North Korean crossing of the Naktong River.