Rear Admiral John A. Dahlgren (fifth from left) and Staff aboard the U.S.S. Pawnee - Charleston Harb…

 Sailors on deck of U.S.S. Monitor cooking food, stove on left,  James River, Va.

Bow of Confederate gunboat Teaser, Lt. Hunter Davidson, captured by U.S.S. Maratanza on July 4, 1862…

Deck of Confederate gunboat Teaser, captured by U.S.S. Maratanza, showing damage from shell fire at …

Medical supply boat "Planter" at General Hospital wharf on the Appomattox 1865, City Point, Va.…

Rear Admiral John A. Dahlgren standing by a Dahlgren gun on deck of U.S.S. Pawnee, Charleston Harbor…

School ship U.S.S. Sabine, Hampton Roads, Va.

Ex-Confederate iron-clad ram Stonewall at anchor; U.S. Capitol in the background june 1965. Washingt…

Commander Thomas H. Stevens of the U.S.S. Maratanza, immediately after capture of the Teaser july 4,…

Battered smokestack from C.S.S. Ironclad ram Virginia No. 2.

Monitor Nahant with Schooner alongside.

 Mortar Schr. C.P. Williams.  Officer next to large mortar "Old Abe" on deck of ship; crew in back…

Sailors on deck of U.S.S. Nipsic with parrott gun, lifeboats, masts and rigging.

Religious services on the deck of the U.S. Monitor Passaic, 1864.

U.S.S. Commodore Perry, ferryboat converted into a gunboat, Pamunkey River, Va., 1864.

Gun crew of a Dahlgren gun at drill aboard the U.S. gunboat Mendota, 1864.

Sailors and marines on the deck of the U.S. gunboat Mendota, 1864.

Confederate Ram Atlanta after being captured on James River, VA. 1863.

 Double-turreted monitor U.S.S. Onondaga on the James River, Va. Circa 1864.

Capt. John A. Winslow (3d from left) and officers on board the U.S.S. Kearsarge after sinking the C.…

First ironclad gunboat built in America, the U.S.S. Saint Louis, circa 1862.

Confederate torpedo boat David aground at Charleston, SC, 1865.

Schooners Sunk to Obstruct Passage on the James River, VA.

Fifteen officers on deck of the original Monitor.