One of the most convincing evidences of the effectivcn<»ss of chemical warfare was its rapidly increasing use as the World War progress^!. This is strikingly illustrated in Chart XIX, which shows the amount «if gas and gas shell used on l>oth sides during each vear of the war.
Owing to the large number of casualties which the Germane scored against the British and French with Yellow Cross (mustard) shell in the summer of 1017, and the great success attained against the Russians by their Colored Shoots, (mixed Green, Blue, and Yellow Cross shells) in the
fall of 1917, the Germans based the artillery preparation for their great offensives in the spring of 1918 on the use of gas shell. Thus gas shell, which in 1915, 1916, and 1917 were used only in special operations for producing casualties and in the general harassment of troops, by the end of 1917 had become so effective that they were incorporated as an important part of the comprehensive tactical plans for the 1918 offensives.
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