Like Fort Conttroyor, Charlotte is in a constant storm, making rogue waves a larger focus than the forts minor 5 defense. Stick close to the fort and the shore as much as possible to cause the waves to dissipate and face the waves and brace as needed. In between watching for waves get in some good Heavy Shot strikes on the defenses and they will go down in no time.
Once you are on the ground, enter the fort via the ramp and then climb the wall to the rampart and follow it left, hitting the two Captains in the courtyard with Berserk Darts and leaving them to die to their allies. Follow the rampart around to the opposite side of the fort and then head up the steps, around the area and continuing up the steps until you approach the final Captain from behind and kill him. You can then enter the doors directly behind the final Captain to defeat the fort's Commander.
After the fort is cleared you can get the Treasure x2, Animus Fragment x2, and start the Naval Contract, Hunter Gatherer.
