Timeline: Von Schlieffen plan October 31 1914 Vistula river The German Vistula River offensive on the Eastern front has failed. Troops are back in their starting positions. November 11 1914 Vistula The German 9th army attacks Russian forces north of the Vistula and routs them, creating a gap in the Russian lines. November 13 1914 Tannenberg The German 1st and 2nd armies attack south in the area of Tannenberg. The 3rd and 4th army supported by Austrian armies start an offensive aimed at Warshaw. November 14 1914 Tannenberg November 17 1914 Warshaw November 21 1914 Warshaw December 5 1914 Warshaw