i'm not so sure about that
in my game as the english egypt went to war with me, i had just gone through a rapid expansion, MANY undefended cities, they had one city at the top fo my island, i over comitted to taking it, leaving my core undefended, believing that my navy was strong enough to stop any ships getting through, but they managed to sneak a galleon full of cavs through, they could have taken my capital and two of my best cities the next turn, but i asked for peace(no way was i giving them anything for it) they accepted the offer one turn before they would have crippled me
dumbasses