Individual #second_battle_of_Ypres__Ypres__battle_of_Ypres  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
  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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