During March, "Sigourney" and her destroyer division operated under the direction of the Commanding General, U.S. XVI Corps, in support of forces on Bougainville. They provided counter-battery fire, bombarded enemy troops and installations ashore, and performed fire support as requested. "Sigourney" engaged in daily bombardments in the Jaba River and Motapena Point area and supported PT boat operations at night. On 12 March alone, "Sigourney" and "Eaton" (DD-510) fired 400 rounds of call fire in support of the 37th Infantry Division perimeter.