Thanks for reference to the American Heritage book on Civil War Art. One of America's greatest Artist, Winslow Homer, got his start in the Civil War. He was "Special Artist" for Harper's Weekly. Harper's sent him to sketch Abraham Lincoln's inauguration, George B. McClellan's army on the Banks of the Potomac in Oct. 1861, and to cover the Peninsular Campaign in 1862.. His illustrations depicting battles and camp scenes appeared in Harpers throughout the war years.
He later translated his drawings into canvases such as the "Yankee Sharpshooter" and "Prisoners at the Front".