 Complete the following phrase:  Initially assigned with his regiment to picket and scout duties in Maryland and Virginia during the fall and winter of 1861, Elliott and his fellow 1st Pennsylvania Cavalrymen were then attached to the Army of the Potomac McCalls division in March 1862, to McDowells I Corps in April, and then to the Unions Department of the Rappahannock Bayards Cavalry, during which time they fought in the Battle of Cross Keys June 8, 1862, skirmished with the enemy at Madison Court House July 23 and Slaughter House August 8, fought in the battles of Cedar Mountain August 9, Thoroughfare Gap August 28, 