The marker for Battery G, 4th U.S. Artillery is on the east side of Branch Avenue. (Branch Avenue South tour map). It was commanded by Lieutenant Marcus P. Miller (USMA 1858) and was armed at Antietam with six 12-pounder Napoleons. The battery is also honored by two monuments at Gettysburg.

From the main marker:

U.S.A.

Battery G, 4th U.S. Artillery

Lieut. Marcus P. Miller, U.S.A., Commanding.

(September 17, 1862.)

Battery G, 4th U.S. Artillery, belonged to the Artillery Reserve, which was attached to the Fifth Army Corps. On the morning of the 17th, the Battery was in the field just east of Porterstown. About 3 P.M., under orders of Brigadier General Geo. Sykes, it reported to Major General Burnside and was put in position on the high ground east of the Rohrbach Lane, from which it overlooked and commanded the approaches to the stone bridge over the Antietam. The Battery was not actively engaged.

No. 111.

From the direction marker:

Battery G
4th U.S. Artillery
1600 Yards East
Afternoon of September 17, 1862

See more on the history of the 4th United States Artillery, Battery G in the Civil War