The British introduce the tank.Īp– The United States declares war against Germany after the interception and publication of the Zimmermann Telegram and the sinking of three US merchant ships by German U-boats. July 1, 1916-November 1916 – First Battle of the Somme River, France. May 31-J– Battle of Jutland, North Sea near Denmark – a sea battle between British and German navies. June 1915-November 1917 – Battles of the Isonzo, Italy.ġ915 – Battle of Krithia, Gallipoli peninsula, Ottoman Empire.įebruary 21 – July 1916 – Battle of Verdun, France, the war’s longest battle, with almost a million casualties. – A German U-20 submarine sinks the British passenger ship, the Lusitania 1,198 are killed, including 128 Americans. Novem– Great Britain and France declare war on the Ottoman Empire.Īpril 22-– Second Battle of Ypres, marking the first wide-scale use of poison gas by Germany. Novem– Russia declares war on the Ottoman Empire. Septem– First battle of the Aisne in France begins, marking the beginning of trench warfare. Britain declares war on Germany.Īug– Austria-Hungary invades Russia, opening the fighting on the Eastern Front.Īugust 26-30, 1914 – Battle of Tannenberg, Prussia. President Woodrow Wilson declares that the United States is neutral. J– Austria-Hungary declares war on Serbia.Īug– Ottoman Empire and Germany sign a secret treaty of alliance.Īug– Germany invades Belgium. J– Gavrilo Princip, who has ties to the Serbian terrorist-type group the Black Hand, assassinates Archduke Franz Ferdinand of Austria-Hungary.
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