In all, more than 500,000 tons of chemical gas agents were used in World War I. Some 500,000 troops were injured and some 30,000 died, including 2,000 American troops.

The soldiers — dubbed the Lost Battalion — sent out messengers to make contact with the rest of the American forces, but none managed to bypass or survive the German line of fire.

In the December 1919 issue, National Geographic shared the firsthand account of how soldiers celebrated far from home in France. Nearly every billet in France where American soldiers last year ...

The May 1, 1863 New York Tribune summed up many Northerners' feelings about African American soldiers when it declared, "Loyal Whites have generally become willing that they should fight ...

The commander of the American Expeditionary Force, General John Pershing had refused to lead black soldiers into battle. Most of the third of a million African Americans drafted into the US Army ...