On the 28th of September, to retain Lee in his position, I sent Ord with the 18th corps and Birney with the 10th corps to make an advance on Richmond, to threaten it. Ord moved with the left wing up to Chaffin's Bluff; Birney with the 10th corps took a road farther north; while Kautz with the cavalry took the Darby road, still farther to the north. They got across the river by the next morning, and made an effort to surprise the enemy. In that, however, they were unsuccessful.

The enemy's lines were very strong and very intricate. Stannard's division of the 18th corps with General Burnham's brigade leading, tried an assault against Fort Harrison and captured it with sixteen guns and a good many prisoners. Burnham was killed in the assault. Colonel Stevens who succeeded him was badly wounded; and his successor also fell in the same way. Some works to the right and left were also carried with the guns in them—six in number—and a few more prisoners. Birney's troops to the right captured the enemy's intrenched picket-lines, but were unsuccessful in their efforts upon the main line.

Our troops fortified their new position, bringing Fort Harrison into the new line and extending it to the river. This brought us pretty close to the enemy on the north side of the James, and the two opposing lines maintained their relative positions to the close of the siege.

In the afternoon a further attempt was made to advance, but it failed. Ord fell badly wounded, and had to be relieved; the command devolved upon General Heckman, and later General Weitzel was assigned to the command of the 18th corps. During the night Lee reinforced his troops about Fort Gilmer, which was at the right of Fort Harrison, by eight additional brigades from Petersburg, and attempted to retake the works which we had captured by concentrating ten brigades against them. All their efforts failed, their attacks being all repulsed with very heavy loss. In one of these assaults upon us General Stannard, a gallant officer who was defending Fort Harrison, lost an arm. Our casualties during these operations amounted to 394 killed, I,554 wounded and 324 missing.

Whilst this was going on General Meade was instructed to keep up an appearance of moving troops to our extreme left. Parke and Warren were kept with two divisions, each under arms, ready to move leaving their enclosed batteries manned, with a scattering line on the other intrenchments. The object of this was to prevent reinforcements from going to the north side of the river. Meade was instructed to watch the enemy closely and, if Lee weakened his lines, to make an attack.

On the 30th these troops moved out, under Warren, and captured an advanced intrenched camp at Peeble's farm, driving the enemy back to the main line. Our troops followed and made an attack in the hope of carrying the enemy's main line; but in this they were unsuccessful and lost a large number of men, mostly captured. The number of killed and wounded was not large. The next day our troops advanced again and established themselves, intrenching a new line about a mile in front of the enemy. This advanced Warren's position on the Weldon Railroad very considerably.

Sheridan having driven the enemy out of the valley, and taken the productions of the valley so that instead of going there for supplies the enemy would have to bring his provisions with him if he again entered it, recommended a reduction of his own force, the surplus to be sent where it could be of more use. I approved of his suggestion, and ordered him to send Wright's corps back to the James River. I further directed him to repair the railroad up the Shenandoah Valley towards the advanced position which we would hold with a small force. The troops were to be sent to Washington by the way of Culpeper, in order to watch the east side of the Blue Ridge, and prevent the enemy from getting into the rear of Sheridan while he was still doing his work of destruction.

The valley was so very important, however, to the Confederate army that, contrary to our expectations, they determined to make one more strike, and save it if possible before the supplies should be all destroyed. Reinforcements were sent therefore to Early, and this before any of our troops had been withdrawn. Early prepared to strike Sheridan at Harrisonburg; but the latter had not remained there.

On the 6th of October Sheridan commenced retiring down the valley, taking or destroying all the food and forage and driving the cattle before him, Early following. At Fisher's Hill Sheridan turned his cavalry back on that of Early, which, under the lead of Rosser, was pursuing closely, and routed it most completely, capturing eleven guns and a large number of prisoners. Sheridan lost only about sixty men. His cavalry pursued the enemy back some twenty-five miles. On the 10th of October the march down the valley was again resumed, Early again following.

I now ordered Sheridan to halt, and to improve the opportunity if afforded by the enemy's having been sufficiently weakened, to move back again and cut the James River Canal and Virginia Central Railroad. But this order had to go through Washington where it was intercepted; and when Sheridan received what purported to be a statement of what I wanted him to do it was something entirely different. Halleck informed Sheridan that it was my wish for him to hold a forward position as a base from which to act against Charlottesville and Gordonsville; that he should fortify this position and provision it.