Captain Ulric Dahlgren. Commanded a detachment of Union cavalry that made a surprise attack on a larger force of Confederate cavalry on this square, July 2, 1863. Important papers for General Lee were taken from the men who were captured.

SE section of Square, Greencastle, PA, United States

Gettysburg Campaign. Here on June 22, 1863, the First N.Y. Cavalry attacked the Southern advance force of cavalry under Gen. A.G. Jenkins. Here died the first Union soldier killed in action in Pennsylvania. Corporal William H. Rihl of Philadelphia, serving in a Pennsylvania unit assigned to the New York regiment.

US 11, Greencastle, PA, United States