The division was commanded at the Battle of Gettysburg by Major General Abner Doubleday, a career army officer from New York, although for most of July 1st Doubleday commanded the First Corps and Brigadier General Thomas Rowley commanded the division.
See Brigadier General Thomas Rowley’s Official Report on the 3rd Division, 1st Corps at Gettysburg
From the monument:
Army of the Potomac
Brig. Gen. Thos. A. Rowley
Major Gen. Abner Doubleday
July 1. Arrived about 11 A. M. The First Brigade took position in field on the left of Reynolds Woods. Second Brigade on Chambersburg Pike relieving Second Brigade First Division. These brigades were actively engaged from 2 to 4 p.m. and retired with the Corps and took position south of the cemetery fronting Emmitsburg Road. The Third Brigade joined at dusk.
July 2. At sunset sent to support of Third Corps on its right at Emmitsburg Road and captured 80 prisoners and recaptured 4 guns.
July 3. In position on left of Second Division Second Corps. Assisted in repulsing Longstreet’s assault capturing many prisoners and three stand of colors.
Casualties Killed 13 Officers 252 Men Wounded 89 Officers 1208 Men Captured or Missing 16 Officers 525 Men Total 2103