Dogger Bank incident
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The Dogger Bank incident occured on October 21, 1904, when the Russian Baltic Fleet mistook a Swedish ship for a Japanese torpedo boat during the Russo-Japanese War. Later that night the Russians thought they were under attack and opened fire on British trawlers in the North Sea, sinking one, The Crane.

The original article can be found at: http://en.wikipedia.org/wiki/Dogger_Bank_incident.
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