The hill itself is a modest elevation just over 2 miles north of the James River. Its strength lay not in its height, but rather in its fields of fire. Gently sloping open fields lay in front of the Union position, forcing any Confederate attacks against the hill to travel across that barren ground. McClellan unlimbered as much artillery as he could at the crest of the hill, facing in three directions. Nearly 70,000 infantry lay in support, most of them crowded in reserve on the back side of the hill.
The dominance of the position enabled less than one-third of the Union army to defeat a larger chunk of the Confederate army. Confederate leaders and soldiers alike could look back on poor command and control as the principal cause of their defeat. The casualty totals were more balanced than expected for a battle in which the outcome never was in doubt. Slightly more than 5000 Confederates fell killed and wounded, while roughly 3000 Union soldiers met a similar fate.