Lewis gunners of the 12th Battalion, Royal Scots, wearing box respirators during a gas attack on a front line trench, Meteren, 25 June 1918.
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: 3042px × 2480px
Photo credit: © CBW / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1, attack, chemical, front, gas, great, mask, masks, men, respirators, royal, scots, soldier, soldiers, trench, trenches, troops, war, warfare, wearing, western, world, ww, ww1
