French raiders attacked Rye, Hastings, Portsmouth, Southampton, the Isle of Wight, and Plymouth from 1337 into the following year. They also seized English merchant vessels and entered the Thames estuary, while rumors of invasion spread. English reprisals struck Norman and Breton ports and sometimes recovered recently stolen plunder. Piracy further endangered shipping, including attacks on English vessels by a Cornish band.
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Coastal raiding turned the Channel into a war zone
French attacks on English ports and merchant shipping triggered reciprocal raids across the Channel.