Army of the Potomac
General Joseph E. Johnston’s Army of the Potomac continued to be concentrated in Northern Virginia around Manassas, although elements were stationed as far forward as the Potomac River.
Major General Thomas J. Jackson’s Army of the Valley was headquartered at Winchester. Brigadier General William Loring’s Army of the Northwest joined Jackson at Christmas. It would retain its name but would be subject to Jackson’s orders in the upcoming campaign.