Individual #third_battle_of_Ypres__Ypres__battle_of_Ypres  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
  part of:  World_War_I  Belgium
  type:  pitched_battle__pitchedbattle  a fierce battle fought in close combat between troops in predetermined positions at a chosen time and place

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