The Collaborative International Dictionary of English v.0.48:

Argonne \Argonne\ n.
   1. an American operation in World War I (1918); American
      troops under Pershing drove back the German armies which
      were saved only by the Armistice on November 11.

   Syn: Meuse, Meuse River, Argonne Forest, Meuse-Argonne,
        Meuse-Argonne operation
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Argonne
    n 1: an American operation in World War I (1918); American
         troops under Pershing drove back the German armies which
         were saved only by the armistice on November 11 [syn:
         Meuse, Meuse River, Argonne, Argonne Forest,
         Meuse-Argonne, Meuse-Argonne operation]