By 10 June, "Fiske" was moored for four days of liberty in Hong Kong, British Crown Colony. Departing for her fifth War Patrol on 14 June, "Fiske" arrived off Quảng Ngãi Province for NGFS duty the next day. She fired 119 rounds of 5 inch, 38 caliber ammunition at four target areas, destroying 18 structures, damaging trenches and ten other structures. The next day found "Fiske" on NGFS station off Da Nang, firing 57 rounds at four target areas, including Viet Cong caves, assembly areas, and one VC Observation Post. During a second mission that day an ammunition dump on a hill top was struck by "Fiske's" shells, which exploded the top of the hill.