monument is on the north slope). In 1893, Chamberlain was awarded a Medal of Honor for both "carrying the advance position on the Great Round Top" and "holding his position on the Little Round Top against repeated assaults" earlier in the day. Battle of Gettysburg, third day The July 3 Wells cavalry charge advanced from the west to beyond the Big Round Top spur and engaged the rear of Law's Alabama regiments to carry the hill and earn Wells' 1891 Medal of Honor. By September 1863, David McConaughy had begun to acquire a portion of Big Round Top for battlefield preservation. The Elon J. Farnsworth monument was erected before 1896 at the base of Big Round Top, and statues of William Wells (1931) and John Michael Tobin are also on the hill. Postbellum Kilpatrick Avenue had been completed at the west base of Big Round Top by 1895 when the gravel South Confederate Avenue was constructed across the northwest slope. In 1903, Wright Avenue was constructed along the northeast slope, and in 1937, South Confederate Avenue and the Plum Run stone bridge were rebuilt for the 75th battle anniversary and reunion. In 1940, Seminary Ridge CCC workers rerouted the stone trail to the Big Round Top summit. Harry Truman visited Big Round Top in 1946. In 1964, the Big Round Top Nature Trail was created around the hill and provided access to the Devil's Kitchen. The 1895 Big Round Top Observation Tower was dismantled in 1968 and the foundation was named a historic ruin in 2004. Observation Tower Late in the day of July 3, Union brigadier general Judson Kilpatrick ordered the cavalry brigade of Brigadier General Elon Farnsworth to charge Confederate infantry of Major General John Bell Hood’s division who were on and near the slopes of Big Round Top. Hood had been wounded the previous day, and his division was under the command of Brigadier General Evander Law. One after another, three of the four regiments of Farnsworth’s brigade charged over broken ground into Confederate fire and were repulsed. The final regiment, the 1st Vermont, then made the attempt. Farnsworth divided it into three battalions and personally led the second battalion. The tower was built in the late 19th century. Fred Lyons of Baltimore led the construction team that moved the foundation's granite blocks to the Big Round Top summit using block and tackle driven by a 12-horsepower