Two Photographs of Union Soldiers Posing With a Captured Confederate 18-Pounder Cannon Nicknamed “Whistling Dick” (1863)

Two photographs of Union soldiers posing with a captured Confederate 18-pounder cannon nicknamed “Whistling Dick.” The gun was responsible for sinking the Union gunboat USS Cincinnati during the Siege of Vicksburg on May 26, 1863.

Source.
Second image from Miller's Photographic History of the Civil War.

Confederate Soldiers of the Perote Guards Posing With an Artillery Piece in the Perote Sand Batteries Near Mobile, Alabama (1861)

Confederate soldiers of the Perote Guards posing with an artillery piece in the Perote Sand Batteries near Mobile, Alabama, 1861. From Miller's Photographic History of the Civil War.

Confederate Artillerymen Posing With Two Artillery Pieces Near Charleston, South Carolina (1861)

Confederate artillerymen posing with two artillery pieces near Charleston, South Carolina, c. 1861. By George S. Cook.

Source.

Three Men Posing With Two Mortars in the Trapier Mortar Battery on Morris Island Shortly After the Surrender of the Nearby Fort Sumter by Union Forces in Charleston Harbor (1861)

Three men posing with two mortars in the Trapier Mortar Battery on Morris Island shortly after the surrender of the nearby Fort Sumter by Union forces in Charleston Harbor, 1861. The battery fired its mortars at Fort Sumter in the bombardment leading to its surrender. The darkroom used by the photographers to develop this photograph is visible behind the mortar in the background. By Osborn and Durbec. From The Blue and Gray in Black and White: A History of Civil War Photography.