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

First Division

Brigadier Gen. J. J. Abercrombie (until 8/12)

Brigadier Gen. Darius N. Couch (after 8/12)

First Brigade

Brigadier General Charles Devens Jr.

2nd Rhode Island Infantry Regiment

7th Massachusetts Infantry Regiment

10th Massachusetts Infantry Regiment

36th New York Infantry Regiment

Third Brigade/Second Brigade

Brigadier General Albion P. Howe

55th New York Infantry Regiment

62nd New York Infantry Regiment

93rd Pennsylvania Infantry Regiment

98th Pennsylvania Infantry Regiment

102nd Pennsylvania Infantry Regiment

Third Brigade

Brigadier General John Cochrane

65th New York Infantry Regiment

67th New York Infantry Regiment

23rd Pennsylvania Infantry Regiment

61st Pennsylvania Infantry Regiment

82nd Pennsylvania Infantry Regiment

Artillery

1st Pennsylvania Artillery, Battery C

1st Pennsylvania Artillery, Battery D