Interior of Fort Fisher, North Carolina.

Officers' quarters at Brandy Station, Virginia.

Camp of the 18th Pennsylvania Cavalry, Brandy Station, Virginia. February 1864.

3d Massachusetts Heavy Artillery Company K, by guns of Fort Stevens, Washington D.C.

Distant view showing the effect of the fire from the assault batteries at Fort Pulaski, Georgia, Apr…

Federal Fort 12#, new lines built after the occupation of the city looking east  Atlanta, Georgia, …

Two soldiers sitting amid Confederate weapons and fortifications, view from rebel fort on Peach Tree…

Federal encampment on Pamunkey River, Cumberland Landing, Virginia, May 1862.

Soldiers at gate of Fort Slemmer, Washington D.C.

Interior view of Fort Sumter on the occasion of the raising of the old flag. (Four field guns on par…

Federal picket line in front of Fort Mahone, Petersburg, Virginia. April 1865.

 Interior of Fort Putnam on Morris Island showing guns which fired over 1200 shots into Sumter. Cha…

Sherman's men in Confederate fort, Atlanta, Georgia. 1864.

Confederate fortifications at Manassas, Virginia. 1862.

Man on horseback at Fort Burnham with tents in background, formerly Confederate Fort Harrison, James…

General R.S. Foster's headquarters.

Headquarters of the Army of the Potomac near Fairfax Court House, Virginia, June, 1863

General J.H.H. Ward Headquarters, February 17, 1864.

Headquarters of General Alfred Pleasonton at Castle Murray (five miles southeast of Warrenton) Aubur…

Bomb-proof H.Q. at Fort Stedman, Petersburg, Virginia. 1865.

Interior view of Fort Sumter showing heavy damage, Charleston, South Carolina 1864. Photo taken by a…

Light house next to Fort Monroe, Virginia. December 1864.

Beacon on parapet at Fort Sumter, Charleston, S.C. April 1865.

Parapet with stacks of ammunition at Fort Sumter, Charleston, S.C.