In 1863, brothers Andrew K. and William Shriver lived on opposite sides of the Littlestown Turnpike at Union Mills and were divided in loyalty, with William supporting the Confederacy and Andrew the Union. Late on June 29, when officers at the head of Gen. J. E. B. Stuart’s Confederate cavalry confronted Andrew Shriver, he declared, “I can tell you I’m a Union man!” Shriver, a slaveholder whose son served in the Union army, soon saw his land, yard, gristmill, sawmill, tannery, and orchard filled with Confederate cavalrymen, while the rest of the column stretched for miles along the turnpike. That night, Confederate Gen. Fitzhugh Lee slept under an apple tree in the orchard behind the house. Only hours after the Confederates left the next day, Gen. George Sykes’s weary Union V Corps marched into Union Mills from Frizzelburg and camped in nearby fields and meadows along Big Pipe Creek. A lieutenant in the 4th Michigan Infantry wrote that he “washed in a rapid stream at Union Mills,” enjoying a short relief from the heat. When 62-year-old Gen. James Barnes needed a bed for the night, Shriver gave him the room once occupied by Washington Irving decades earlier. On the morning of July 1, V Corps marched north across the Mason-Dixon Line into Pennsylvania.