Here in Washington County, major battles were fought during the Civil War. Just south is the Antietam National Battlefield where on September 17, 1862, the bloodies battle in American history took place leaving 22,717 dead, wounded, or missing. The Battle of Antietam is well documented here by markers and plaques showing how and where the battle progressed. In Williamsport, the Chesapeake & Ohio Canal National Historical Park celebrates the 184.5 mile long canal that runs along the Potomac River in Maryland. It served many communities with supplies but never made it to Pennsylvania where it was to bring coal from to DC.