Use by the Russian Army of protective means against German chemical weapon applied during the First World War.

The first can be considered the simplest mask gauze or cotton-gauze impregnated with sodium hyposufite, which pressed to his face and breathed through it (i. e. <> gas mask, based on the principle of chemical neutralization of toxic substances).

[Use of chemical war gases at the Russian-German front during the First World War].

The First World War was notable for the widespread use of machine military hardware and absolutely new type of weapon--chemical weapon. As a result of the first gas attack by chlorine undertaken by the German army against the Russian armies on May, 31st, 1915, heavy poisonings have received 9100 people, 6000 of them died. Chemical attack of Germany against Russia was limited by the use chemical gases of suffocating action: chlorine, bromine,phosgene and diphosgene.