Following repairs, "Amphitrite" remained on duty at Rosebank, interspersing guardship duties with upkeep and repairs at the New York Navy Yard, into October 1918. Leaving New York on 24 October for Hampton Roads, "Amphitrite" carried out standardization runs and target practice at Tangier Sound in late October and the first week of November; on 8 November, she left Tangier Sound, via Hampton Roads, for Rosebank. She arrived back at Staten Island on 11 November 1918, the day the war ended in Europe with the armistice. Ultimately, "Amphitrite" left New York for Philadelphia on 30 April 1919, arriving on 1 May.