In the course of her operations toward the end of that period, the yacht cast off from Commonwealth Pier, at the Boston Section Base, at 0055 on 26 March 1918, with one petty officer and eight enlisted men of a naval port guard detachment embarked for passage to Plymouth.

Admiral proceeded uneventfully south by east until 0420, when she struck a boulder off Brant Rock, near the town of Scituate, Massachusetts, and began shipping water.

The latter returned with the two Coast Guard boats soon thereafter, while Admiral's remaining men expeditiously offloaded ammunition, fittings, and stores into the ship's lifeboats, dory, and cutter.

[4] After being raised and refitted for service, Admiral was placed in commission at Baker's Yacht Basin, Quincy, Mass., on 1 August 1918 and assigned to "Group 2, Minesweepers," in the 1st Naval District's Boston section.

She soon resumed patrol operations and continued this duty through February 1919, ranging from her section base at Boston to Rockland, Maine, and the Portsmouth, NH Navy Yard.