On 15 September 1950 the US 1st Marine Division, ROK marines and 7th Infantry Division troops led the surprise attack at Inchon. The landing met with little resistance and was resounding success with few casualties. On 16 September 1950, the Eighth Army launched an offensive to break out of the Pusan Perimeter and link up with the Inchon forces away. Supporting Eighth Army, the 8th flew 60 medium altitude, 99 low-level, and 298 night intruder sorties. During these missions they dropped 422 tons of explosives.