Plan XVII
Plan XVII (pronounced [plɑ̃ dis.sɛt]) was the name of a "scheme of mobilisation and concentration" which the French Conseil Supérieur de la Guerre (the peacetime title of the French Grand Quartier Général) developed from 1912 to 1914, to be put into effect by the French Army in the event of war between France and Germany. The plan was for the mobilisation, concentration and deployment of the French armies to make possible an invasion either of Germany or of (neutral) Belgium or of both, before Germany completed the mobilisation of its reserves simultaneous with an expected Russian offensive.