On April 22, 1915 at 5 p.m. a wave of asphyxiating gas released from cylinders embedded in the ground by German specialist troops smothered the Allied line on the northern end of the Ypres salient, causing panic and a struggle to survive a new form of weapon.
The attack forced two colonial French divisions north of Ypres from their positions, creating a 5-mile gap in the Allied line defending the city. This was the first effective use of poison gas on the Western Front and the debut of Germany’s newest weapon in its chemical arsenal, chlorine gas, which irritated the lung tissue causing a choking effect that could cause death.
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