Battle of Ypres was deadly war because of the weapons used and the number of Casualties of soldiers and citizens of Ypres that why it became a major battle.
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In 1914, the first battle of Ypres began followed by second, April 1915.the first was failed attempt on the German side to obtain control over city,instead forming a salient for allied forces.
British won the first battle in 1914 but German option, after their defeats at the First Battle of the to attempted one more breakthrough operation to win a decisive victory in 1914.