During their second term they were involved in heavy combat being part of the Army of the Potomac during Lieutenant General Ulysses S. Grant's Overland Campaign.

For their first two months of service, they served garrison duty as part of the defenses of Washington at Camp Barry and later at Hall's Hill in Arlington, Virginia.

During the winter and early spring of 1864, the unit was frequently used as cavalry, conducting picket and reconnaissance duty between Centreville and Union Mills, Virginia.

Reaching Washington, the battery was attached to the Second Division (commanded by Major General Robert B. Potter) of the IX Corps, assigned to the Army of the Potomac.

[4] The battery took part in the major battles of the Overland Campaign, though they were not heavily engaged until moved to the front lines on June 19 during the start of the Siege of Petersburg.

[5] On August 21 and 22, the battery took part in the Battle of Weldon Railroad while temporarily attached to the II Corps.

[6] When the Confederates abandoned Petersburg and retreated towards Appomattox Court House, the 11th Massachusetts Battery joined other elements of the Army of the Potomac in pursuit.