The Thomas Farm on Monocacy National Battlefield, 4632 Araby Church Road (Visitor Center) outside Frederick, Maryland. The farm was owned by Christian Keefer Thomas and is a treasure trove of Civil War history. Maj. Gen. Winfield Scott Hancock once used its brick farmhouse as a headquarters as his corps marched north to Gettysburg. On July 9, 1864, the farm was the scene of fierce fighting during the Battle of Monocacy. That fall, Lt. Gen. Ulysses S. Grant held a council of war at the house with his cavalry chief, Maj. Gen. Philip Sheridan.