An American Soldier Firing a Chauchat Light Machine Gun From Behind a Barricade Made of Sandbags and Ammunition Boxes During World War 1 (1910's)

An American soldier firing a Chauchat light machine gun from behind a barricade made of sandbags and ammunition boxes during World War 1.

Workers Posing With a Pile of Unfinished Brodie Helmets in the Budd Manufacturing Company Factory in Philadelphia, Pennsylvania (1910's)

Workers posing with a pile of unfinished Brodie helmets in the Budd Manufacturing Company factory in Philadelphia, Pennsylvania, c. 1910's. From the book Helmets and Body Armor in Modern Warfare by Bashford Dean.

American Troops Aiming Their Rifles Down a Road in Bonvillers, France (1918)

American troops aiming their rifles down a road in Bonvillers, France, May 22, 1918. Possibly an authentic combat photograph.

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Two American Soldiers Keeping Watch From the Ruins of an Observatory in Montfaucon, France (1918)

Two American soldiers keeping watch from the ruins of an observatory in Montfaucon, France, October 17, 1918.

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American Soldiers of the 79th Infantry Division Posing With Captured German POWs and Machine Guns During World War 1

American soldiers of the 79th Infantry Division posing with captured German POWs and machine guns during World War 1. From the Official History of the 315th Infantry.

Scottish Soldiers Boarding Trucks Which Will Transport Them to the Front Line (1917)

Scottish soldiers boarding trucks which will transport them to the front line, April 1917.

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Two Newly Liberated French Civilians Greeting Two American Soldiers in Brieulles-sur-Bar, France (1918)

Two newly liberated French civilians greeting two American soldiers in Brieulles-sur-Bar, France, November 6, 1918.

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British Soldiers in and Around a Trench During the Battle of Arras in France (1917)

British soldiers in and around a trench during the Battle of Arras in France, 1917. Smoke from artillery shell explosions can be seen in the distance.

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Canadian Soldiers Posing in a Reserve Trench on the Western Front During World War 1

Canadian soldiers posing in a reserve trench on the Western Front during World War 1.

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Animated Stereoview of British Soldiers in a Trench Demonstrate Keeping Watch Over No Man's Land With a Mirror (1910s)

British soldiers keeping watch over the top of their trench with a mirror. Published by Keystone View Company.

Source: New York State Military Museum.