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Choose a Page:When were aircraft first used in b...*What caused the outbreak of the Fi...*What was trench warfare?Who led the Germans during the Sec...What kind of weapons were used in ...What was D-Day?What were the main alliances durin... What caused the outbreak of the First World War? The murder of the heir to the Austrian throne, Archduke Franz Ferdinand, on June 28, 1914, finally started the First World War (1914-18). He was killed by a Serb, causing Austria to declare war on Serbia.   Previous: Back Book: Best Ever Q&A Section: History Chapter: World Wars