July 23—Austro-Hungarian ultimatum to Serbia.
July 28—Austria-Hungary declares war on Serbia.
July 31—General mobilization in Russia. "State of war" declared in Germany.
Aug. 1—Germany declared war on Russia and invaded Luxemburg.
Aug. 2—German ultimatum to Belgium, demanding free passage across Belgium.
Aug. 3—Germany declares war on France.
Aug. 4—War declared by Great Britain on Germany.
Aug. 4—President Wilson proclaimed neutrality of United States.
Aug. 4-26—Belgium overrun: Liege occupied (Aug. 9); Brussels (Aug. 20); Namur (Aug. 24).
Aug. 6—Austria-Hungary declares war on Russia.