What is called the second battle of Ypres began with a bombardment of the little city on April 20, 1915. The rain of shells continued on through April 22, 1915, on the evening of which the British artillery observers reported a strange green vapor moving over the French trenches. The wind was blowing steadily from the northeast. Soon the French troops were staggering back from the front, blinded and choking from the deadly German gas. Many of their comrades had been unable to leave the spot where they were overtaken by the fumes. Those who fled in terror rushed madly across the canal, choking the road to Vlamertinghe. A part of the Zouaves and Turcos ran south toward the Langemarck road, finally reaching the reserve battalions of the Canadians. Ere long the Canadians caught the deadly odor also.

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