Below is a list of all the Union units that were in Stafford during the First Federal Occupation.  Major General Irvin McDowell (above)  commanded the Department of the Rappahannock.

Brig. Gen. Rufus King’s Division:

Brig. Gen. C. C. Augur’s (1st) Brigade: 22nd, 24th, 30th, 84th New York Infantry and 2nd U.S. Sharpshooters

Brig. Gen. Marsena R. Patrick’s (2nd) Brigade: 21st, 23rd, 35th, 80th New York Infantry

Brig. Gen. John Gibbon’s Brigade: 19th Indiana and 2nd, 6th, 7th Wisconsin Infantry

Cavalry: 2nd New York (Harris Light) (8 companies)  Div. Artillery: (4 batteries)

Brig. Gen. G. A. McCall’s Division:

Brig. Gen. John F. Reynolds’ (1st) Brigade  Div. Artillery: (4 batteries)

Brig. Gen. G. G. Meade’s (2nd) Brigade

Brig. Gen. Truman Seymour’s (3rd) Brigade

Brig. Gen. E. O. C. Ord’s Division:

Brig. Gen. James B. Ricketts’ (1st) Brigade  Div. Artillery: (4 batteries)

Brig. Gen. Abram Duryea’s (2nd) Brigade

Brig. Gen. G. L. Hartsuff’s (3rd) Brigade

Cavalry: 1st Maine and 1st Rhode Island

Maj. Gen. James Shields’ Division:

Brig. Gen. Nathan Kimball’s (1st) Brigade  Div. Artillery: (5 batteries)

Brig. Gen. Orris S. Ferry’s (2nd) Brigade

Brig. Gen. Erastur B. Tyler’s (3rd) Brigade

Separate Brigades:

Brig. Gen. Abner Doubleday’s Brigade

Brig. Gen. John Geary’s Brigade (mixed infantry, cavalry and artillery)

Brig. Gen. George D. Bayard’s Cavalry Brigade: 1st New Jersey, 1st Pennsylvania, and 1st Pennsylvania Rifles (last is an infantry battalion)

3rd Maine Battery (as pontoniers)

Headquarters Guard: 2nd New York (Harris Light) Cavalry (remaining 2 companies)