When Union General George McClellan marched toward the Confederate capital of Richmond in 1862, he encountered the Warwick River -where it wasn't supposed to be.- McClellan was following a map created by an esteemed topographer, but the map was wrong -The Cram Map- that McClellan was using is one of the removable maps in Great Maps of the Civil War . So is the map Union Gen. James B. McPherson was carrying when he was killed on July 22, 1864, just...