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The Twelfth Army Corps had over 13,000 men in 28 infantry regiments and 4 artillery batteries, organized into 3 divisions of three or four brigades each and an artillery brigade.
1st Brigade
5th Connecticut
20th Connecticut
3rd Maryland
123rd New York
145th New York
46th Pennsylvania
2nd Brigade
1st Maryland, Potomac Home Brigade
1st Maryland, Eastern Shore
150th New York
3rd Brigade
27th Indiana
2nd Massachusetts
13th New Jersey
107th New York
3rd Wisconsin
5th Ohio
7th Ohio
29th Ohio
66th Ohio
28th Pennsylvania
147th Pennsylvania
29th Pennsylvania
109th Pennsylvania
111th Pennsylvania
60th New York
78th & 102nd New York
137th New York
149th New York
1st New York, Battery M
Pennsylvania Independent Battery E
4th United States, Battery F
5th United States, Battery K