O'Brien-class destroyer

The O'Brien class was a class of six destroyers designed by and built for the United States Navy shortly before the United States entered the First World War, the third of five classes known as thousand-tonners because they were the first American destroyers over 1,000 long tons. The design was an incremental development of the Aylwin class, itself similar to the Cassin class, and its key change was the move to 21-inch torpedoes from 18-inch. The ships displaced about 1,050 long tons, were just over 305 feet long and carried four 4-inch guns and four twin torpedo tubes. They were built by four yards, Bath Iron Works, Fore River, New York Shipbuilding and Cramp, and were commissioned between June 1914 and August 1915. All six escorted convoys from Queenstown in the war, Nicholson helped sink U-58, and all had been sold for scrapping by June 1936. Bath Iron Works in Maine built one, McDougal.