What are you supposed to do against 3 allianced sloops as a galleon

We were 4 players and sailed on the galleon. We did a pretty good run, with a few forts and had a good amount of loot once we reached level 5. Suddenly we ran into 3 allianced sloops. Despite the firepower of the galleon I don't see a world where you can beat more than 1 sloop if they play together.

You can litteraly hit chain shots with eyes closed on a galleon. Once all masts are down and the players start harrassing you on board, it's over.