The Confederate Railway Gun "Little Merrimack", 1862.
In the spring of 1862 the Union Army occupied a railway stop called Savage Station on the Richmond and York River railroad.
In light of this, Gen. Robert E. Lee came up with an interesting,
yet unorthodox idea. He first consulted with the Confederate
Chief of Ordnance Colonel Josiah Gorgas if a heavy gun could be mounted on a railway car. Gorgas said it was impossible, so he turned to Capt. George Minor of the Confederate Navy. Capt.
Minor assembled a crew that built a war machine the likes of
which had never been used in warfare before.
The navy men mounted a 32 pound naval cannon weighing over
6,000 pounds on an open rail car. The men then built a thick wooden angled structure around the gun, which was covered
with a layer of iron for protection. Nicknamed the "Land
Merrimack" after the famous ironclad warship, it was pushed by a locomotive and could travel the speed of marching infantry.