The Collaborative International Dictionary of English v.0.48:

Chateau-Thierry \Chateau-Thierry\ n.
   a World War I battle in northwestern France where the Allies
   defeated the Germans in 1918.

   Syn: battle of the Marne, Belleau Wood, Marne River.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Chateau-Thierry
    n 1: a World War I battle in northwestern France where the
         Allies defeated the Germans in 1918 [syn: Battle of the
         Marne, Belleau Wood, Chateau-Thierry, Marne River]