If you don't stay and fight: what to do with your ships?
You could immediately set sail for the mainland and GTFO.
You could also bombard the land.
Finally, you could try to save as many Krocyleans as you can, at danger to yourselves. (For every 10 points of Naval Strength you have, roll a d10. On a 3 or below, lose 5 points of Navy and 5 points of Military. On a 4 or above, gain 5 points of Favor.)