The alliance between the Central Powers of World War 1 doesn't seem to be as strong anymore. The Bulgarians, the Austro-Hungarian Empire and Germany are following their own goals without really helping out the other. Erich von Falkenhayn is obsessed with Verdun, Conrad von Hötzendorf wants to go on the offensive again after the 5th Battle of the Isonzo and the Bulgarians don't have the resources to pursue their own goals. At the same time the unrestricted submarine warfare of the Germans is taking a deadly toll.
