Life in Camp, 6th Corp Headquartersca. 1864Group on Porch1860sPart of Construction Corps Building New Military Truss Bridge Across Bull RunApril 1863[Prof. Maillefert and Naval Officers Employed to Remove Gunpowder from Confederate Torpedoes, James River, Virginia]April 1865[Bayonet Drill]ca. 1863Marshall House, Alexandria, Virginia1861