Mahone hits the gap; Barlow's division collapses in minutes near Petersburg
Grant's siege of Petersburg was only days old when he ordered two Union corps to sever the Weldon Railroad — the supply line keeping Petersburg and Richmond alive. On June 21–23, 1864, the II Corps under Maj. Gen. David B. Birney and the VI Corps under Maj. Gen. Horatio G. Wright pushed southwest toward the tracks near Petersburg, Virginia. Swamps and thickets split the two corps apart, and Brig. Gen. William Mahone — a former railroad engineer who knew exactly how to use a ravine — hit the gap at 3 p.m. on June 22 and collapsed Brig. Gen. Francis C. Barlow's division in minutes. The railroad stayed Confederate for now, though Grant simply extended his siege lines west and kept reaching…
