Plan of attack used by the German armies at the outbreak of World War I .
It was named after its developer, Count Alfred von Schlieffen (1833–1913), former chief of the German general staff. To meet the possibility of Germany's facing a war against France in the west and Russia in the east, Schlieffen proposed that, instead of aiming the first strike against Russia, Germany should aim a rapid, decisive blow with a large force at France's flank through Belgium, then sweep around and crush the French armies against a smaller German force in the south. The plan used at the beginning of World War I had been modified by Helmuth von Moltke , who reduced the size of the attacking army and was blamed for Germany's failure to win a quick victory.