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1. 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
   - battle of Ypres, second battle of Ypres
    
2. 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
   - battle of Ypres, first battle of Ypres
    
3. 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
   - Battle of Passchendaele, battle of Ypres, third battle of Ypres

Type of: pitched battle

Part of: First World War, Great War, War to End War, World War 1, World War I

Encyclopedia: Ypres, Belgium