The marker for Caldwell’s Brigade of Richardson’s Division is on the north side of the Sunken Road. (Sunken Road East tour map)

From the marker:

U.S.A.

Caldwell’s Brigade, Richardson’s Division

Brig. General John C. Caldwell, Commanding.

Organization.
5th New Hampshire, 81st Pennsylvania, 7th, 61st and 64th New York Infantry

(September 17, 1862.)  

Caldwell’s Brigade relieved Meagher’s and became heavily engaged with the Confederate Infantry occupying the Sunken Road and Piper’s cornfield south of it. After an obstinate contest, the Brigade succeeded in dislodging the Confederates from the Sunken Road and, having repelled several attempts to turn its flanks, advanced to the high ground overlooking Piper’s house, where it was halted by command of General Richardson.

No. 45.

See the Order of Battle for Richardson’s Division of the Second Corps at Antietam.