World War I: Brewing before the War By Wessel Wang Oct 7, 1879 Germany and Austria signed a military alliance treaty Period: Oct 7, 1879 to Jun 29, 1913 The saber rattling before the First World War October 7, 1879-June 29, 1913, the first half of the First World War Aug 17, 1892 France and Russia signed a military agreement, and the confrontation between the two major military blocs began. Aug 31, 1907 Britain and Russia signed a mutual assistance agreement, and the Three-country Agreement was formally established. Jun 29, 1913 Serbia, Greece, Montenegro, Romania, and Turkey declared war on Bulgaria, and the Second Balkan War broke out.
