The monument to the 1st United States Artillery, Battery K is south of Gettysburg on the South Cavalry Battlefield. (map)
From the monument:
Army of the Potomac
Second Brigade Horse Artillery
Battery K First U. S. Artillery
Six 3 inch Rifles
Captain William M. Graham, commanding
July 3. Arived on the field and took position on the left with cavalry and engaged during the attack of Brig. General E .J. Farnsworth’s and Brig. General W. Merritt’s Brigades on the Confederate right.