In 1905, Schlieffen was chief of the German General Staff. Europe had effectively divided into two camps by this year - Germany, Austria and Italy (the Triple Alliance) on one side and Britain, France and Russia (the Triple Entente) on the other.
Schlieffen believed that the most decisive area for any future war in Europe would be in the western sector. Here, Schlieffen identified France as Germany's most dangerous opponent. Russia was not as advanced as France in many areas and Schlieffen believed that Russia would take six weeks to mobilise her forces and that any possible fighting on the Russian-German border could be coped with by the Germans for a few weeks while the bulk of her forces concentrated on defeating France.
Schlieffen concluded that a massive and successful surprise attack against France would be enough to put off Britain becoming involved in a continental war. This would allow Germany time (the six weeks that Schlieffen had built into his plan) to transfer soldiers who had been fighting in the successful French campaign to Russia to take on the Russians.
Schlieffen also planned for the attack on France to go through Belgium and Luxemburg. Belgium had had her neutrality guaranteed by Britain in 1839 - so his strategy for success depended on Britain not supporting Belgium.
The Schlieffen Plan was revised as tension in Europe increased. However, the basic mechanics of it remained the same:
a devastating attack on France via Belgium as soon as Russia had announced her intention to mobilise.
a holding operation on the Russian/German border to be carried