A inch howitzer of the Royal Garrison Artillery in action, shells lined up in front, September 1917.
As far as my research is able to ascertain, I believe this image to be a part of the public domain and free of any copyright restrictions. However if you are intending to use it commercially it is recommended to make sure that there are no restrictions for your use in your country.
Size: 1600px × 1180px
Photo credit: © CBW / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1, action, artillery, field, field-gun, field-guns, firing, france, front, great, gun, gunners, guns, howitzer, howitzers, men, soldier, soldiers, troops, war, western, world, ww, ww1