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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 whiched started World War 1
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It is during this battle that the Germans first use poison gas.
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The Battle of Verdun was the longest battle of World War I and was one of the bloodiest.
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During the Battle of the Somme, tanks are first introduced into battle.
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Fighting ends on the 11th hour of the 11th day of the 11th month (i.e. 11 a.m. on November 11).
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