The first railway gun used in battle was a banded 32-pounder Brooke naval rifle. In the American Civil War it was mounted on a flat rail car and protected with sheets of iron. On 29 June 1862, Robert E. Lee had the gun pushed by a locomotive over the Richmond and York River line (later part of the Southern Railway) and used at the Battle of Savage's Station. There is also a photo of a Union 13-inch siege mortar mounted on a rail car during the Siege of Petersburg, Virginia. It was nicknamed the "Dictator" or the "Petersburg Express".