FRANK, THE GETTYSBURG WAR HORSE: Meet Frank a veteran of the Civil War. he was assigned to Issac R. Swartout, private of Battery D of the 1st NY Artillery. Frank first saw action with his owner at Gettysburg on July 1st 1863. He proceeded to participate in 14 more battles from The Wilderness and Cold Harbor, all the way thru to the surrender of Lee at Appomatox Court House April 9th 1865. He was purchased by Isaac after the war and remained with him the rest of his life. Here is a scan of the back of this souvenir photo.
From: Wild Bill Burroughs on Tumblr