Hooker still remained quiescent, engaged in trying to obtain 15,000 men as reinforcements.

He was but partially successful, for as soon as the New York regiments reached Baltimore, Lockwood's brigade of Maryland troops, about three thousand, was ordered to join the Army of the Potomac, and was assigned to the Twelfth Corps.
The Army of the Potomac at this time was posted as follows: The Twelfth Corps at Leesburg, supported by the Eleventh on Goose Creek, between Leesburg and Aldie; the Fifth Corps near Aldie, and the Second at the next pass below, both supported by the Third Corps at Gum Springs.

The First Corps was behind the Eleventh and Twelfth Corps, near Guilford, on the Loudon and Hampshire Railroad.

Our cavalry, which had left Aldie, covered the approaches to Leesburg.
On the 23d they had a sharp engagement at Dover, on the road from Aldie to Leesburg, with part of Stuart's force, who beat up their quarters, but they drove off their assailants without much difficulty.
Lee now, with a prudent regard to a possible defeat, requested the authorities at Richmond to have a reserve army under Beauregard assemble at Culpeper; a request which was looked upon by Davis as one quite impossible to carry out, owing to the scarcity of troops, and the necessity of reinforcing Johnston in the West and Beauregard in the South.
Two of Ewell's divisions, those of Rodes and Johnson, reached the frightened town of Chambersburg on the 23d.

The other, under Early, took the road to York, _via_ Gettysburg, and halted on that day at Waynesborough.
By this time twenty regiments of militia were on their way from New York to Baltimore and Harrisburg.
Longstreet crossed the Potomac at Williamsport, and Hill at Shepherdstown, on the 24th.