This is a list of the events of World War I in chronological order.
1914 Dates Theater/Front/Campaign Events June 28 Politics Assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, who was killed in Sarajevo along with his wife Sophie, Duchess of Hohenberg, by Gavrilo Princip, a Bosnian Serb. July 6 Politics Austria-Hungary seeks German support for a war against Serbia in case of Russian military intervention. The German Empire gives assurances of support. July 23 Politics Beginning of the "Black Week". Austria-Hungary sends an ultimatum to The Kingdom of Serbia. Serbia responds that night, agreeing to most but not all terms of the ultimatum. The Serbian response is seen as satisfactory by the Kaiser, but German diplomats do not pressure Austria to make peace. (details) July 24 Balkan Serbia mobilizes, expecting Austria to declare war after the refusal of the ultimatum. July 25 Eastern Austria mobilizes against Serbia. Russia enters the period preparatory to war (partial mobilization). July 28 Politics To my peoples. Austria-Hungary declares war on Serbia. July 29 Politics Willy–Nicky correspondence. Wilhelm II, German Emperor and Nicholas II of Russia communicate via telegram. July 30 Politics Germany sends Russia an ultimatum.July 31PoliticsSweden announces neutrality in the conflict between Austria-Hungary and Serbia.Politics Russia mobilizes for war.July–AugustPolitics1914 Dashnak Congress, Armenian Revolutionary Federation refuses demands to encourage Armenian revolts in the Russian Empire August 1 Politics Germany declares war on Russia and mobilizes. Western France mobilizes. Politics Italy declares its neutrality. Politics The German–Ottoman alliance. Germany and the Ottoman Empire sign a secret alliance treaty.The Treaty of Alliance Between Germany and Turkey 2 August 1914, Yale University August 2Western Germany invades Luxembourg. (details)Western Skirmish at Joncherey, first military action on the Western Front. August 2 – 26Western Germany besieges and captures fortified Longwy, "the Iron Gate to Paris", near the Luxembourg border, opening France to mass German invasion. August 3 Politics Germany declares war on France. Belgium denies permission for German forces to pass through to the French border. Politics Switzerland declares its neutrality and mobilises for defence purposes.F.A. Kuenzli, Right and Duty, or Citizen and Soldier: Switzerland Prepared and at Peace, A Model for the United States (New York: National Defense Institute, 1916), 94.PoliticsSweden declares neutrality in the conflict between Germany, Russia and France. August 4Western The German invasion of Belgium (1914) to outflank the French army.