Union General-in-Chief Henry Halleck quickly identified the need to check the September 1862 Confederate advance into Maryland. He remarked, "There is every probability that the enemy, baffled in his intended capture of Washington, will cross the Potomac, and make a raid into Maryland or Pennsylvania. A moveable army must be immediately organized to meet him again in the field."
Harpers Ferry, West Virginia 25425
Harpers Ferry National Historical Park