I Corps (South Korea) was created July 24, 1950, just before the Battle of Pusan Perimeter. I Corps consisted of the 8th Infantry Division and the Capital Division. During the battle of the Pusan Perimeter (July–September, 1950), its headquarters was at Sangju. Currently, I Corps is the largest corps in the ROK Army. I Corps is organized with three infantry divisions, one mechanized infantry division, and several separate brigades.