Germany in Two-Front War and the Schlieffen-Plan

Austria-Hungary starts the bombardment of Belgrade. What follows is a race of armies between all major powers in Europe. Nobody wants to be unprepared in case of an attack. Germany is implementing the Schlieffen-Plan to avoid a two front war by conquering Paris via Belgium. One thing gets clear in the first days at the Western Front: This war is going to be different - the modern warfare shows itself.