On June 6 he withdrew Warren’s V Corps from the lines and used it to secure the passages across the Chickahominy and down to the James. On June 7 he sent Sheridan, with two divisions of cavalry, back into the Shenandoah Valley against Early. To counter this, Lee was forced to send Gen. Wade Hampton’s cavalry after Sheridan, which in effect left Lee without adequate cavalry. During the night of June 12 Grant secretly moved all the troops out of the trenches at Cold Harbor, without Lee’s being aware of the move until the following morning, and by June 16 the Army of the Potomac of over 100,000 men, 5,000 wagons, 2,800 head of cattle, and 25,000 horses and mules, were all safely across the James River. Richmond was saved for another 10 months.
[Illustration: _Pontoon bridge across the James._ Courtesy, National Archives.]
In the pre-dawn darkness of September 29, Grant quietly slipped Gen. David Birney’s X Corps and Gen. Edward Ord’s XVIII Corps back across the James in a surprise move against the outer defenses of Richmond. The primary purpose was to prevent Lee from re-enforcing Early in the Shenandoah Valley. If, however, any weakness was discovered it could be exploited fully, and it might force Lee to weaken some part of the Petersburg line.
Shortly after daybreak Gen. George Stannard’s division of the XVIII Corps successfully stormed heavily armed but badly undermanned Fort Harrison on the Varina road. Gen. Hiram Burnham, commanding the leading brigade, was killed in the assault and the Union forces renamed the captured fort for him. A mile and a half farther north, Gen. Adelbert Ames’ division of the X Corps was repulsed in a similar attack on another fortification, Fort Gilmer, on the New Market road.
[Illustration: _Area of the Richmond battlefields._ From _Battles and Leaders of the Civil War_.]
General Lee regarded the loss of Fort Harrison as serious enough to demand his personal attention. The next day, with re-enforcements rushed from Petersburg, he directed several vigorous assaults against the fort. However, the Union forces had closed in the rear and strengthened it, and, armed with new repeating rifles, successfully beat back the attacks and inflected heavy losses on the Confederates.