U.S. Army - Army of the Potomac - First Army Corps

First Division

Brigadier General J.S. Wadsworth (until 7/15)

Brigadier General L. Cutler (after 7/15)

The 1st Division suffered 56% casualties of the 3,800 men it brought into action at Gettysburg, most on the first day's fighting west of town. Three regiments - the 24th Michigan, 2nd Wisconsin and 147th New York - lost over 70% of their men. After the battle the Iron Brigade was down to six hundred men, and received reinforcements from Dix's Department of Virginia.

First ("Iron") Brigade

Brigadier General S. Meredith (w 7/2)

Colonel William W. Robinson (after 7/2)

19th Indiana Infantry Regiment

Colonel Samuel J. Williams (w 7/1)

Lt. Colonel William W. Dudley (w&c 7/1)

Major John M. Lindley (w 7/1)

24th Michigan Infantry Regiment

Colonel Henry A. Morrow (w&c 7/1)

Lt. Colonel Mark flanagan (w 7/1)

Major Edwin Wight (w 7/1)

Captain Albert M. Edwards

2nd Wisconsin Infantry Regiment

Colonel Lucius Fairchild (w&c 7/1)

Lt. Col. George H. Stevens (mw 7/1)

Major John Mansfield (w 7/1)

6th Wisconsin Infantry Regiment

Lt. Colonel Rufus R. Dawes

7th Wisconsin Infantry Regiment

Colonel William W. Robinson

Lt. Colonel John B. Callis (w&c 7/1)

Major Mark Finnicum (w 7/1)

1st New York Sharpshooter Battalion

from Dept. Va., 7th Corps, 1st Div., 1st Bde.

167th Pennsylvania Infantry Regiment

Colonel Joseph D. Davis

from Dept. Va., 7th Corps, 1st Div., 1st Bde.

Second Brigade

Brigadier General L. Cutler (until 7/15)

Colonel E. B. Fowler (after 7/15)

7th Indiana Infantry Regiment

Colonel Ira G. Grover

14th New York State Militia (84th N.Y.)

Colonel Edward Fowler

76th New York Infantry Regiment

Major Andrew J. Grover (k 7/1)

Captain John E. Cook (after 7/1)

95th New York Infantry Regiment

Colonel George H. Biddle (w 7/1)

Major Edward Pye (after 7/1)

147th New York Infantry Regiment

Lt. Colonel Francis C. Miller (w 7/1)

Major George Harney (after 7/1)

56th Pennsylvania Infantry Regiment

Colonel John W. Hofmann