The marker for Brooke’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.

Brooke’s Brigade, Richardson’s Division

Col. John R. Brooke, 53d Pennsylvania Infantry, Commanding.

Organization.
2d Delaware Infantry
52d New York Infantry
57th New York Infantry
66th New York Infantry
53d Pennsylvania Infantry

September 17, 1862.

Brooke’s Brigade formed the reserve of Richardson’s Division.

After checking an attempt of the enemy to gain the right rear of French’s Division near Roulette’s house, it co-operated with Caldwell in his advance across the Bloody Lane and through the cornfield to the south, the advance Regiments driving the enemy from Piper’s barn and outhouses. The ammunition of the Brigade having been exhausted, it was withdrawn and occupied a position a short distance north of this point, in support of Battery K, 1st U.S. Artillery.

No. 47.

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