In this 1917 photograph, a French soldier wearing a gas mask mans a Klaxon horn used to warn his fellow soldiers of an impending gas attack. As you examine the photograph, focus on the details that reveal aspects of industrial warfare. What does this photograph tell you about the differences between World War I and earlier conflicts?

Illustration from The Illustrated War News, 24 January 1917, French photographer (20th century) / Private Collection / The Stapleton Collection / The Bridgeman Art Library.