After further repairs at the Navy Yard from 2–17 March "Amphitrite" resumed duty with the Naval Militia of Connecticut, arriving at New Haven on 18 March. She carried out this training duty, with drafts of men from Yale and Harvard for instruction in ordnance, signalling, and seamanship, into early April. With the entry of the U.S. into World War I at that time, "Amphitrite" departed New Haven on 7 April for the New York Navy Yard and repairs and alterations. She returned to Rosebank to guard the nets on 15 April. She was assigned to the 3d Naval District on 27 April 1917.