The cavalry battalion of the Maryland Line, commanded by Col Bradley T. Johnson, joined the Army of Northern Virginia during the Overland Campaign. The Line suffered losses in the Battle of Haw's Shop on May 27, 1864. The Marylanders also participated in the actions related to the Battle of Cold Harbor. They later participated in Jubal Early's campaigns in the Shenandoah Valley. The infantry battalion was engaged at Cold Harbor. Eventually it was assigned to the corps of LTG Ambrose Powell Hill during the Siege of Petersburg. The artillery units also participated in the Virginia campaigns of 1864-1865.