Now, let's assume Germany stays on the defensive in the West, but now the Russians get the worst of it - and are shrieking for relief. Attacking into Alsace and Lorrain does only lead to exorbitant losses without sizeable gains. Therefore, Joffre will soon be pressing to be allowed to attack through Belgium. After some prevarication, Sir Edward will figure out that the Ardennes are not really Belgium, as hardly any Belgians are living there, and after some serious diplomatic arm-wrestling the Belgian government will agree. - Not that the operation will not lead to another bloodbath for the French, but such a venue is perfectly conceivable.