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> fisherman in the same seas as thousands of british fisherman loaded with their soldiers?

Logistically it was impossible to launch an invasion at the same time as the Dunkirk evacuations were happening. Even if they manage to get to England on a few fishing boats what would they do there?

> Would the royal navy lay waste to thousands of french fisherman

The British didn’t have that many qualms about blowing up a significant part of the French navy as a mere precaution. So yes. That not how successful naval invasion work though anyway. https://en.m.wikipedia.org/wiki/Attack_on_Mers-el-Kébir