Wilderness Campaign: Topic PageIn the American Civil War, a series of engagements (May–June, 1864) fought in the Wilderness region of Virginia. Early in May, 1864, the Northern commander in chief, Grant, led the Army of the Potomac (118,000 strong) across the Rapidan River into the Wilderness, a wild and tangled woodland c.10 mi (16 km) W of Fredericksburg.