A photo essay from Time LightBox shows a series of rare colour images from the front-line in France during World War 1.
The above photograph is not one of the LightBox series, which carry a copyright mark, but appears in a group of comments about a set of images from the Library of Congress. The commenter noted that the original French uniforms had red pants, which led to enormous casualties from sniper fire early in the war. The uniform was subsequently changed to the light blue in the picture.
Thanks to GeneaNet for highlighting the LightBox photos.