On 4 May, "Wichita" returned to Majuro for a month of training. In June, she returned to the fleet, which was gathering at Kwajalein in preparations for operations against the Mariana Islands. "Wichita" was assigned to Task Unit 53.10.8, which shelled Saipan on 13 June. The next day, "Wichita" bombarded Japanese gun positions on Guam, before returning to Saipan later that day. On 17 June, she joined Task Group 58.7; the force patrolled to the west of the Marianas over the next three days in an attempt to intercept the large Japanese carrier force known to be approaching. On 19 June, the Japanese carriers struck at the American fleet, starting the Battle of the Philippine Sea. "Wichita" contributed to the antiaircraft screen; her gunners claimed to have assisted in the destruction of two Nakajima B5N torpedo bombers. The ship was detached to cover troop transports and escort carriers off Saipan on 25 June. This duty lasted through the first week of July. Now part of Task Unit 53.18.1, "Wichita" bombarded Japanese positions on Guam on 8–12 July, and again starting on 18 July.