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Assassin's Creed 4: Black Flag Walkthrough Part 26 – Sequence 4: “Overrun and Outnumbered” Part 2
http://www.rarityguide.com/articles/articles/5533/1/Assassins-Creed-4-Black-Flag-Walkthrough-Part-26--Sequence-4-Overrun-and-Outnumbered-Part-2/Page1.html
By Douglas Shepard (Editor in Chief, RarityGuide.com)
Published on 11/13/2013
 
A series of articles covering Assassin's Creed IV: Black Flag. This covers the memory, "Overrun and Outnumbered " with Edward Kenway helping free the Assassins and his own crew.

Assassin's Creed 4: Black Flag Walkthrough Part 26 – Sequence 4: “Overrun and Outnumbered” Part 2

Optional Objectives:
Use 8 Sleeping Darts on guards
Use 2 Berserk Darts on guards

From the Tower head to the West and keep on the Northern side of the Hut. There is another Gunner that can spot you otherwise. It is not quite time to deal with him. Look below this hut to find another Gunner with his musket fixed on Prisoners. Hit him with a Berserk Dart to draw in the other Soldier. You can either let them fight it out or go for a Double Aerial Assassination. Be sure that all 3 of the Soldiers in the area are dead before you drop down and free the Assassins there.

Make your way to the South now. You have another Gunner in a tower to deal with. Hit him with a Sleep Dart. Follow that by ducking into the Stalking Zone behind the hut with the next prisoners. Hit both Gunners with Berserk Darts and let them finish off whoever is in the area. Just be quick to free the prisoners as occasionally the Gunners will attack and kill one of the prisoners. With those prisoners free, head to the Northeast, toward the next string of Prisoners.

You just need to free this group of prisoners to finish the mission. There are only  few guards. Slip into the outer Stalking Zone. When the patrolling Soldier is nearby then Whistle to lure them in for a quick kill. There are a number of enemies around the final group. Either you can hit them with Berserk Darts or Sleep Darts, whatever is needed to reach the optional objective. Deal with them and free the prisoners. This will complete the memory.

As a tag at the very end of the mission, James shows Edward the Assassin Contracts. Likely you have stumbled across them. They are a good way to make some money quickly. You can see the various ones available and head out to any of them to complete them. This is important as you need to have funds available at the start of Sequence 6.

You can also talk to James Kidd after the mission. He will offer a Templar Hunt Mission that you can start. Be sure to keep talking to him until he leads you to some ruins. This reveals where you can place all those Mayan Stones that you have found. After that just head on back to the ship. Time to move things forward and get on to hunting more Prizes and even more plunder. Just head on out to sea.