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RMS Republic, a passenger ship of the White Star Line, becomes the first ship to use the CQD distress signal after colliding with another ship, the SS Florida, off the Massachusetts coastline, an event that kills six people. The Republic sinks the next day.
Battle of Belleau Wood in World War I: the U.S. Marine Corps suffers its worst single day's casualties while attempting to recapture the wood at Château-Thierry (the losses are exceeded at the Battle of Tarawa in November 1943).
Carloman I and Charlemagne are crowned kings of the Franks.
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