Medieval boats

We are going to jump forward a thousand years or more, but very much stick to toys that have not only never been out on the table, but probably never will be.

Scenario suggestions would be welcome. I did once have a a vague idea of doing something around the siege of St Michael's Mount during the Wars of the Roses. I believe that something along those lines was done at a show at some point, but I've never been able to track down any photos.