History: Australian infantry with small box respirator gas masks, Battle of Polygon Wood, Ypres, BelgIum, September 1917, during WWI. [1200 x 1607]

https://i.redd.it/xf1ccezum6e51.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/i169lv/australian_infantry_with_small_box_respirator_gas/?utm_source=ifttt