The second battle of Ypres, 22 April-25 May 1915, was a rare German offensive on the Western Front during 1915. It was launched with two aims in mind. The first was to distract attention from the movement of German troops to the eastern front in preparation for the campaign that would lead to the victory of Gorlice-Tarnow. The second was to assess the impact of poisoned gas on the western front. Gas had already been used on the eastern front, at Bolimov (3 January 1915), but the tear gas used there had frozen in the extreme cold.
At Ypres the Germans used the first lethal gas of the war, chlorine. The gas was to be released from 6,000 cylinders and would rely on the wind to blow it over the allied trenches. This method of delivery controlled the timing of the attack – the prevailing winds on the western front came from the west, so the Germans had to wait for a suitable wind from the east to launch their attack.
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