Union Headquarters Markers
Third Brigade,
Second Division, Fifth Army Corps 
On Sykes Avenue at the summit of Little Round Top.
From the monument:
Army of the Potomac
Fifth Corps Second Division
Third Brigade
Brig. Gen. Stephen H. Weed
Col. Kenner Garrard
140th 146th New York
91st 155th Pennsylvania Infantry
July 2. Arrived early in the morning and lay on the Baltimore Pike near Rock Creek until late in the day. Moved hastily to the left leading the Division and took position on Little Round Top on the right of Third Brigade First Division in time for the 140th New York to repel an attack at that point. The other regiments having moved to the right to the support of Battery I 5th U. S. and Third Corps line were brought back and went into position on the right of the 140th New York. Brig. Gen. Weed commanding Brigade and Col. P. H. O'Rorke commanding 140th New York were mortally wounded.
July 3. Remained in position until the close of the battle.
Casualties Killed 2 Officers 38 Men Wounded 11 Officers 131 Men Captured or Missing 18 Men Total 200
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