I was in the negative almost 50k rum and was tired of being in the negative. So I decided to gt rid of all the units that were semi useless that used lot's of rum. I send in 5k flying dutchmen's to a defensive prize and it wins. Apparently flying dutchmen's can win battles on defensive prizes but not offensive. If you send them into an offensive prize they will all die killing nothing. So after getting rid of 5k dutchmens I go kill a prize to claim my banking points. what happens next is funny, they gave me 212k rum as reward along with like 100+ Juggernauts and 30+ subs. The 212k rum  was such a huge waste it just sank away because i was still in the negative. Should have did it when my rum supply was high so I would have got other stuff besides the rum. So if you are new to the game and can't build any armada units besides the flying dutchmen just build them and use them to kill defensive prizes you will get other armada units in exchange that you can't build in the process. It's a good trade off for ya when you can't build any armada units until like 3 months or more into the game, took me longer. Took me 4 and a half months before I can start building subs with lot's of help from others giving me sketches.