Organization of the 12th Corps of the Federal Army of the Potomac during the Civil War Battle of Gettysburg, July 1-3, 1863. The 12th Corps had 28 infantry regiments and 4 artillery batteries at Gettysburg, organized into two divisions of three brigades each and an artillery brigade.
12th Corps (monument) Major General Henry Slocum (^ Right Wing) (monument) Brigadier General Alpheus S. Williamsstrength: 10,700 men, 20 guns
casualties: 205 killed, 810 wounded, 65 missing, 1,080 total
10th Maine Infantry, Companies A, B & D (monument) Captain John D. Beardsley
1st Division(monument) Brigadier General Alpheus S. Williams (^ July 1)
Brigadier General Thomas H. Ruger
strength: 5,255 men
casualties: 95 killed, 405 wounded, 30 missing, 530 total