Gambier Bay, "Kitkun Bay", Cassin Young (DD-793), Callaghan (DD-792), Irwin (DD-794), and Porterfield (DD-682) formed a new task unit on 1 August 1944, and charted a course for an operating area east of Guam. The carriers launched planes that provided air cover over the soldiers and marines battling the Japanese for control of the island (2–4 August). At 1704 on the 3rd, an Avenger of VC-10 flying an antisubmarine patrol from Gambier Bay sighted a periscope and attacked with depth charges, causing oil and debris to rise to the surface. The enemy submarine escaped.