In July, 1918, he assumed command of the five naval railway batteries in France. Under his direction those mobile units of 14-inch battleship guns supported French and American armies from 6 September until the Armistice. Awarded the Distinguished Service Medal for his service during the war, he later commanded Destroyers, US Atlantic Fleet, and served as Chief of Staff, Naval War College; President, Board of Inspection and Survey; and as Commandant, New York Navy Yard and the Third Naval District.
Retiring in 1928, Rear Admiral Plunkett died at Washington, D.C., 24 March 1931.
Source: Naval History & Heritage Command including Dictionary of American Naval Fighting Ships.