1. battle in World War I (1917); an Allied offensive which eventually failed because tanks bogged down in the waterlogged soil of Flanders; Germans introduced mustard gas which interfered with the Allied artillery
2. battle in World War I (1915); Germans wanted to try chlorine (a toxic yellow gas) as a weapon and succeeded in taking considerable territory from the Allied salient
3. battle in World War I (1914); heavy but indecisive fighting as the Allies and the Germans both tried to break through the lines of the others
And pile them high at Ypres and Verdun.
There is relatively little information about Ypres, maybe you can watch a bilingual story to relax your mood, I wish you a happy day!
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