They will inevitably be destroyed.

Oh! if they would but give up the struggle and withdraw to safety, even though my last hope would go with them! The nations can consult and arrive at some other plan for destroying the island.

They can surround the place with a belt of ships that the pirates cannot break through and starve them to death like so many rats in a hole.
But I know that the warships will not retire, even though they know they are going to certain death.

One after the other they will all make the attempt.
And I am right.

Signals are exchanged between them.