I haven't seen the episode, so I have no real way of knowing what it depicts, but I have written about medieval naval battles before if it's of some interest:

https://www.reddit.com/r/AskHistorians/comments/3l1yf1/how_was_naval_warfare_fought_before_the_invention/

https://www.reddit.com/r/AskHistorians/comments/1lmtd5/what_advances_in_naval_technology_were_made/cc103fr/

https://www.reddit.com/r/AskHistorians/comments/2krusl/why_did_the_spanish_armada_ultimately_fail/