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Gas masks are used to protect people especially soldiers when gases are used in warfare or domestic disturbances. They were used in World War I to protect soldiers against mustard gas.
The gas mask
Gas masks were developed to protect from the new gas warfare. Widespread use of trenches. Neither was terribly effective.
They die.
Children and some women were evacuated from the big cities into the countryside. People carried gas masks to protect themselves and built air raid shelters . All windows and doors were blacked out. Some people also hid in the underground stations and even slept, ate and stayed there; they were provided with food and babies had to sleep in draws.They used aerial covers
The use of mustard gas in World War One was a terrible and inhumane weapon. Gas masks were the best protection soldiers had to avoid breathing in this gas.
Gas masks are used to protect people especially soldiers when gases are used in warfare or domestic disturbances. They were used in World War I to protect soldiers against mustard gas.
The gas mask
their stomach gas
Skunks protect themselves by letting out an odorous gas and scaring aways predators.
Gas masks were developed to protect from the new gas warfare. Widespread use of trenches. Neither was terribly effective.
People wear gas masks to protect themselves
They don't have any. Instead they use foul-smelling gas to protect themselves, similar to a shield bug.
The government issued gas masks. Air raid sirens would go off and everyone would hurry to bomb shelters. Everyone had blackout curtains. Many children were shipped off to the countryside where few bombs fell.
I am uncertain of your usage of the word "did" are you referring to a certain war or time frame? During training the Soldiers in the US Army are trained according to regulation.1.Stop Breathing and Close your Eyes2. Don your mask and other gear3. Sound the alarm.See FM 3-11 NBC Operations 3-11.4 (NBC Protection)See FM 3-7 NBC HandbookIn reference to "3." there are multiple ways to Sound the Alarm.
Zyklon B
Gas had been used a great deal in the First World War and many soldiers had died or been injured in gas attacks. Mustard gas was the most deadly of all the poisonous chemicals used during World War I. It was almost odourless (could not be smelt easily) and took 12 hours to take effect. It was so powerful that only small amounts needed to be added to weapons like high explosive shells to have devastating effects. There was a fear that it would be used against ordinary people at home in Britain (civilians) during WW II