Video from a Military Working Dog demonstration held at Petersburg National Battlefield Park in Virginia on February 7, 2015. It was on the 150th Anniversary of the 3rd day of the Battle of Hatcher's Run that took place from February 5-7, 1865. A dog mascot of the 11th Pennsylvania Veteran Volunteer Infantry Regiment named Sallie was killed at the battle. The military working dogs were from Fort Lee, Virginia.