"Incapacitate the Man O War" is a mission objective in Sequence 8 / Memory 01: Do Not Go Gently
Walkthrough[edit]
Go to full sail to get within range. Use the Telescope to mark it so you can see the range between you and it. Use Mortar fire to weaken the Man O War and get some damage in on the other ships. Still, focus on the Man O War. It will not take too much with a good mix of fire.