Portrait of Union Soldiers of the 39th Illinois Volunteer Infantry Regiment Posing With a Billinghurst Requa Battery Rapid-Fire Gun on Morris Island, South Carolina (1863)

Portrait of Union soldiers of the 39th Illinois Volunteer Infantry Regiment posing with a Billinghurst Requa Battery rapid-fire gun on Morris Island, South Carolina, 1863. The gun was under command of Lieutenant Wheeler and Lieutenant Kingsbury, who are presumably the two officers posing on the left. Probably taken by the photography firm of Haas and Peale. From the book The History of the Thirty-Ninth Regiment Illinois Volunteer Veteran Infantry. (Yates Phalanx.) in the War of the Rebellion 1861-1865 by Charles M. Clark.

Billinghurst Requa Battery gun Wikipedia entry.

Two Allied Soldiers Examining the Position of a Dead German Machine Gunner on a Bank of the Canal du Nord During the Battle of Canal du Nord, France (1918)

Two Allied soldiers examining the position of a dead German machine gunner on a bank of the Canal du Nord during the Battle of Canal du Nord, France, 1918. From the book Souvenir: New Exhibition of Canadian Official War Photographs in Colour.

A British Machine Gun Platoon Guarding a Road Possibly During a Training Exercise During World War 1 (1910's)

A British machine gun platoon guarding a road possibly during training exercise during World War 1. By Paul Thompson. From the book The World War a History of the Nations and Empires Involved and a Study of the Events Culminating in the Great Conflict published in 1915.

Portrait of British Soldiers of the 1st Volunteer Battalion, Royal Fusiliers Posing With a Maxim Machine Gun (1901)

Portrait of British soldiers of the 1st Volunteer Battalion, Royal Fusiliers posing with a Maxim machine gun, c. 1901. From Black and White Illustrated Budget.

Ottoman Soldiers Posing in a Trench in Harcira, Palestine (1917)

Ottoman soldiers posing in a trench in Harcira, Palestine, 1917. By the American Colony in Jerusalem.

Source.

A German Machine Gun Crew in a Trench During the Battle of Tannenberg Near the Masurian Lakes in East Prussia (1914)

A German machine gun crew in a trench during the Battle of Tannenberg near the Masurian Lakes in East Prussia, August 1914.

Source.

American Troops Posing with a Gatling Gun at Fort McKeen in North Dakota (1880)

Animated stereoview version.

American troops posing with a Gatling gun at Fort McKeen in North Dakota, c. 1880. By F. Jay Haynes.

Source.
Harvard Business School source.
North Dakota state government source.

Union Soldiers Posing With a Billinghurst Requa Battery Rapid-fire Gun on Main Street in Rochester, New York (1862)

Union soldiers of the 18th Independent Battery, New York Light Artillery, posing with a Billinghurst-Requa Battery rapid-fire gun on Main Street in Rochester, New York, c. 1862.

Source.