The marker for Dana’s Brigade of Sedgwick’s Divisionis on the east side of Maryland Route 65 north of Confederate Avenue. (Philadelphia Brigade Park tour map)

Dana's Brigade, Sedgwick's Division, marker 38 of the War Department Union markers at Antietam

From the marker:

U.S.A.
Second Army Corps

Dana’s Brigade, Sedgwick’s Division

Brig. Gen. N.J.T. Dana, Commanding.

Organization.
19th Massachusetts Infantry
20th Massachusetts Infantry
42nd New York Infantry
59th New York Infantry

September 17, 1862.

Dana’s Brigade, following Gorman’s in column of attack, passed through the East Woods, crossed the Cornfield and the Hagerstown Pike, about 50 yards in rear of Gorman, and entered the West Woods, where its advance was checked about 40 yards east of this point.

Its left flank having been attacked and turned, by McLaws’ and Walker’s Divisions, it was compelled to retire.

A portion of the Brigade, with the 1st Minnesota Infantry, occupied a line near the Nocodemus house which it held for a time until, its flank having been again turned, it retired to the woods and fields east of the Hagerstown Pike.

No. 38.