# Fritz Haber, an infamous professor at University of Karlsruhe is the man who invented mustard gas.
# Mustard gas could easily affect moist areas of the body, so blisters would form near armpits and the groin area.
# Germany concentrated the Flesquières salient with mustard gas instead of aiming it directly. This helped the Germans in keeping the British soldiers distracted.
# Next was a British small box respirator, quite a sophisticated mask acquainted to the British troops in the year 1916. It gained popularity by 1917, when almost all the British soldiers were spotted wearing one.
# It was used heavily in 1917 and 1918. British army did not rely heavily on this gas, until 1917 when the British troops had captured German mustard gas shells in large numbers.