During the week before the Battle of Gettysburg, the attention of the Union Department of the Susquehanna's commander, Major General Darius N. Couch, was on protecting vital railroad bridges and other transport and communications routes in south-central Pennsylvania between Harrisburg and the Mason-Dixon Line. Among his particular areas of interest were the bridges on the Northern Central Railway in York County.
Couch dispatched the newly raised 20th Pennsylvania Volunteer Militia under Colonel William B. Thomas to protect the NCR. Thomas, one of the earliest backers of the Republican Party in Pennsylvania, was a political ally of President Lincoln and through patronage had received the coveted and influential post or Port Collector of Philadelphia, in charge of the Customs House and the tax revenue collection. He raised a regiment of nearly 1,000 emergency militiamen in mid-June 1863 and obtained arms and uniforms from the state at Camp Curtin in Harrisburg before entraining for York County.
Colonel Thomas made his headquarters in a hotel in downtown York and scattered his men in an 18-mile line on several farms from York Haven in northern York County down past Seitzville well to the south. Their positions can be determined from a study of York County Border Claims in Harrisburg and from the records of known troop movements.
Several companies were assigned to patrol the railroads south of York, including protecting bridges near Reynolds Mill, Hanover Junction, and Glen Rock, as well as the Howard Tunnel. Lt. Colonel William H. Sickles set up a campsite on the sprawling Jacob Bowman farm along today's state route 616 south of Hanover Junction at a place later known as Larue.
Here are some photos of the general area, as well as a description of the damage claim of farmer Bowman...



