Ypres
      n 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 [syn: {battle
           of Ypres, third battle of Ypres]
      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 [syn: {battle
         of Ypres, second battle of Ypres]
      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 [syn: battle of Ypres, {first
         battle of Ypres]