 Initially assigned to the 1st Naval District in northern New England, "Arcady" acted as duty and guard boat at the Boston Navy Yard in Boston.She also conducted patrols off Provincetown, Massachusetts, and near the Cape Cod Canal.In October 1918, "Arcady" was reassigned to the 2nd Naval District in southern New England, where she performed patrol duty from her base at Submarine Base New London at New London, Connecticut, through the end of World War I and into the spring of 1919.