Assassin's Creed III - Sequence 9 - Bitter End
Note: When you encounter a Man-of-War, don't blow it up. Use chain shot to immobilize it. You need to preserve it to avoid desync.
The only tricky optional objective is get a kill streak of 3 enemies.
The most convenient point for this to happen is when you face an officer and 2 pirates jump down to join the fight. Counter-kill one of the 3 enemies and then use a rope dart to kill the other two. If you haven't been using the rope dart for multi-kills, just mash the tool button (with rope dart equipped) while selecting/moving in the direction of a vulnerable enemy during a kill streak. Connor will kill the targeted enemy with a blade and will fatally pierce another enemy with a rope dart.
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