On July 30, 1914, Tsar Nicholas II ordered the general mobilization of Russian forces, a crucial escalation in the July Crisis. This decision came after initially ordering only partial mobilization against Austria-Hungary in support of Serbia. The full mobilization order was transmitted from St. Petersburg at 5pm and effectively committed Russia to war. Germany interpreted this action as an aggressive move and delivered an ultimatum demanding Russia cease all military preparations within 12 hours, which ultimately led to Germany's declaration of war on August 1, 1914.