In July 1862 Captain Palmer, 1st Lt. William Spencer, and 12 men were detailed to raise three additional companies of similar recruits to form a battalion to be known as the 1st Anderson Cavalry, with the Anderson Troop as its Company A. The recruiters, however, received sufficient applications to raise an entire regiment, which was authorized and became the 15th Pennsylvania Volunteer Cavalry. Palmer left the troop to become colonel of the 15th and Spencer the lieutenant colonel.
