"Sink the enemy ships" is a mission objective in Sequence 9 / Memory 02: Trust Is Earned
Walkthrough[edit]
Sail into the area of Principe. A little ways in you will need to defend yourself against 5 Enemy ships. Most are Gunboats. You will find yourself also facing a Frigate. Take out the weaker ships first. If you have a well-upgraded Mortar, you will have little trouble taking out the Gunboats. After that just focus on the Frigate and take it down.
