John Mitchell Vanderslice (August 31, 1846 - March 12, 1915) was a United States soldier who fought for the Union Army during the American Civil War as a member of the 8th Pennsylvania Cavalry.
He received his nation's highest award for valor, the U.S.
Medal of Honor, for being the first man to reach the rifle pits of the Confederate States Army during a charge made by his regiment on CSA fortifications in the Battle of Hatcher's Run, Virginia on February 6, 1865.A practicing lawyer post-war, he also played an active part in the Commonwealth of Pennsylvania's memorialization of its role in the Civil War, persuading his fellow members of the Grand Army of the Republic and Gettysburg Battlefield Monument Association to place a small memorial stone at Little Round Top — the first of a series of monuments to be erected at the Gettysburg National Battlefield during the late 1800s and early 1900s."During the late 1800s, he also researched and published his book, Gettysburg Then and Now: The Field of American Valor, Where and How the Regiments Fought and the Troops They Encountered.