The marker for Tyndale’s Brigade of Greene’s Division is on the east side of Hagerstown Pike across from the Dunker Church. (Visitor Center – Dunker Church tour map) This is the second of two markers about Tyndale’s Brigade. The first is on Smoketown Road.Tyndale's Brigade, Greene's Division, marker 53 of the War Department Union markers at Antietam

From the marker:

U.S.A.
Twelfth Army Corps

Tyndale’s Brigade, Greene’s Division

Lt. Col. Hector Tyndale, 28th Penn. Infantry, Commanding.

Organization.
5th Ohio Infantry
7th Ohio Infantry
66th Ohio Infantry
28th Pennsylvania Infantry

September 17, 1862.

Tyndale’s Brigade, after the right flank of the enemy had been turned, pursued through the East Woods, crossed to the south side of the Smoketown Road and passing to the right of Mumma’s burned out buildings, halted behind the ridge a few yards east of this point, where, with the assistance of Monroe’s and Tompkins’ Rhode Island Batteries, it repulsed several assaults of the enemy.

About 10:30 A. M. the Brigade crossed the road and entered the woods on the right of the Dunkard Church. Joined on the right by the 13th New Jersey Infantry of Williams Division, it remained in this position until noon when it was compelled to retire to the East Woods.

No. 53.