The first to use gas (tear gas) was by the french in August 1914 in the form of tear gas grenades (xylyl bromide) against the Germans. however the Chlorine gas was introduced to the trenches by German forces on 22 April 1915, at the start of the Second Battle of Ypres.
Ypres, France
Poison Gas Tanks Aeroplanes
Germany was the first country to use poison gas
Poland
SERBIA
Poison gas was first used by the Germans at Second Battle of Ypres during the First World War.
Poison gas was first used during this battle
Germany
the Germans :)
Ypres, France
Poison Gas Tanks Aeroplanes
Germany was the first country to use poison gas
Poland
Poland
Belgium
SERBIA
First versions of tanks, machine guns(immobile), poison gases, and gas masks.