Battery "B", 4th Regiment of Artillery was a light artillery battery that served in the Union Army during the American Civil War.
The battery was attached to McDowell's Division, Army of the Potomac, to March 1862.
Artillery, 1st Division, I Corps, Army of the Potomac, to April 1862.
Artillery, 3rd Division, Department of the Rappahannock, to June 1862.
Artillery, 1st Division, III Corps, Army of Virginia, to September 1862.
Artillery, 1st Division, I Corps, Army of the Potomac, to May 1863.
Reconnaissance from Fredericksburg to Orange Court House July 24–27.
Pope's Campaign in northern Virginia August 16-September 2.
Operations at Pollock's Mill Crossing April 29-May 2.
Boydton Plank Road, Hatcher's Run, October 27–28, 1864.
Junction, Quaker and Boydton Roads March 29.