Career
Stewart immigrated to the United States from Scotland in 1844. Military As a second lieutenant, at the Battle of Antietam, his artillery were the first deployed into the Cornfield, helping to stop Hood"s Division. When the commanding officer Captain Campbell was wounded, Stewart took command.
Stewart commanded the 4th United States., Battery B, the only regular artillery battery of I Corps during the Battle of Gettysburg.
This battery also suffered the highest overall casualty figure of any I Corps battery. During the first day of fighting at Gettysburg, Stewart was placed in front of the Thompson House, supported by three regiments from Pennsylvanians.
On August 1, 1864, he was brevetted a captain for "gallant services at the Battle of Spotsylvania Court House and during the present campaign before Richmond.."
Union General John Gibbon described Stewart as "the best first sergeant I ever saw in the service.".
