Gas alarm at Beaumont Hamel, December 1916.

Gongs and bells were positioned along the front line so that sentries could raise the alarm in the event of a gas attack. Hand-held rattles, horns and whistles were also adopted as means of warning troops. Lantern slide from a box of 80 lantern slides associated with the Western Front, 1917. One of 29 boxes of lantern slides. Associated World War One, Western Front (1914-1918).