On Mon. 13 Nov 1939 German destroyers Z20, Z18, Z19, and Z21 mined the.....

German destroyers Z20, Z18, Z19, and Z21 mined the mouth of the River Thames in southern England, United Kingdom before dawn. At 0526 hours, British cruiser HMS Adventure hit one of the mines and was damaged, killing 23. At 0820 hours, British destroyer Blanche also hit one of the mines and was badly damaged, killing 1 and wounding 12; as Blanche sank while under tow by tugboat Fabia, she became the first British destroyer lost to enemy action in WW2.

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