As General Rufus King's Union division marched eastward along the Warrenton Turnpike, now U.S. Route 29, it came under fire from Confederate artillery on a distant ridge. Captain Joseph Campbell's Battery B, 4th U.S. Artillery wheeled off the road and into position atop this rise to return fire. Campbell's six guns effectively silenced the Confederate batteries, allowing Federal infantry to confront the Confederates on the neighboring Brawner Farm. These were the opening salvos of the Second Battle of Manassas.