When the air turned poisonous, the Canadians didn’t retreat; they stood and fought.This episode dives into the first poison‑gas attack at Ypres and the brutal legacy it left behind. From the shock of the green cloud to the lifelong scars of gas exposure, we follow the Canadians who faced a weapon the world had sworn never to use. A visceral journey into terror, survival, and the moment modern war crossed a line it could never uncross.