Analysis of information sources in references of the Wikipedia article "Battle of Hampton Roads" in English language version.
The Government vessels had been scuttled in the afternoon before the Pawnee arrived, to prevent their being seized by the Secessionists... The following are the names of the vessels which were destroyed: Pennsylvania, 74 gun-ship; steam-frigate Merrimac, 44 guns; sloop-of-war Germantown, 22 guns; sloop Plymouth, 22 guns; frigate Raritan, 45 guns; frigate Columbia, 44 guns; Delaware, 74 gun-ship; Columbus, 74 gun-ship; United States, in ordinary; brig Dolphin, 8 guns; and the powder-boat. [Missing: New York, 74 gun-ship, known to have been on the stocks at the Gosport Navy Yard near Norfolk and destroyed at this time.]