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•June 28 - Archduke Franz Ferdinand, heir to Austria-Hungary's throne, and his wife, Sophie, are assassinated by Serbian nationalist Gavrilo Princip while the couple were visiting Sarajevo.
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•February 4 - Germany declares a "war zone" around Great Britain, essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets.
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•February 21 - The Battle of Verdun begins. The Battle of Verdun was the longest battle of World War I and was one of the bloodiest. this battle was one of the longest battle of world war I.
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The Battle of the Somme begins. During the Battle of the Somme, tanks are first introduced into battle
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Germany sends the secret Zimmerman Telegram to Mexico in an effort to entice Mexico to join the war. The British intercept and decipher the coded message.
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The armistice agreed upon between the new Russian government and the Central Powers goes into effect.
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Russia signs the Treaty of Brest Litovsk, which is a peace treaty between Russia and the Central Powers.
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German flying ace, Baron Manfred von Richthofen (more commonly known as the Red Baron), is shot down.
