Today marks the 100th anniversary of the beginning of World War I. Take a look back at one of the bloodiest conflicts in human history.
Today marks the 100th anniversary of the beginning of World War I, when Austria-Hungary invaded Serbia following the assassination of Archduke Franz Ferdinand. The battle would last a bloody four years and cost more than 37 million civilian and military lives in one of the deadliest conflicts in human history.
Photo: U.S. Coast Guard
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