As United Nations forces prepared to go on the offensive, "Horace A. Bass" played an important part in the planning for the upcoming Inchon operation. Her raiding parties reconnoitered possible landing beaches between 20 August 1950 and 25 August 1950, and departed Pusan on 12 September 1950 for the main Inchon assault. "Horace A. Bass" put her troops ashore in the first wave on 15 September 1950, as the extremely successful amphibious operation suddenly reversed the course of the war.