Henry House Hill is a location near Bull Run in Virginia. Named for the house of the Henry family that sits atop it, the hill begins near the road of Centreville, Virginia, after Warrenton, Virginia, to the today's U.S. Route 29, the Warrenton Turnpike. It is a slow, constant rise toward the south over a length of approximately 730 meters. This hill was an important site of the battles of First and Second Bull Run (also known as First and Second Manassas) in the American Civil War. The battle raged on the north side of the hill in predominantly open grass country; the south side was relatively closely covered with trees. The hill received its name from Dr. Isaac Henry, who lived with his family in a house on the plateau of the hill. On July 21, 1861, the house was inhabited by his widow, Judith Carter Henry, and their two sons. The 85 year old woman was bed-ridden and unable to leave the house.