The Fortress is the fifth chapter of Drake's Fortune. Upon exiting the forest, Nate followed the path to the outer walls of the fortress he had spotted earlier.
In Drake's Fortune Remastered, completing the chapter in less than 10 minutes unlocks the silver trophy "These Walls Can't Stop Me".
Story[]
Lacking a conventional entrance, Nate scaled the fortress's exterior walls. Once inside, he encountered several groups of pirates. After clearing the initial courtyard, Nate continued his search for Elena, heading toward the ruined tower where she had originally landed.
Nate spotting Elena from inside the watchtower.
Upon reaching the tower, Nate found the parachute harness empty. After climbing up, he used a zipline to reach a small watchtower, where he spotted Elena filming from an upper window of the main fort. Attempting to reach her, Nate used a radio to trick a gatekeeper into unlocking a gate below. However, the guard became suspicious and brought reinforcements. Following a heavy gunfight against waves of pirates, Nate proceeded into the flooded chambers of the fortress to find a path to Elena's position.
Walkthrough[]
Climbing the walls[]
Nate scales the fortress walls.
The path along the fortress exterior consists of ledges and vines. Be cautious, as some ledges will crumble upon contact. When using vines, build sufficient momentum before swinging to the next handhold. After entering through a window, head right through the hallway to find another opening. Continue scaling the exterior until reaching a final vine; press 
to have Nate swing through the window and back into the interior.
The courtyards[]
Inside, a Micro - 9mm and several Mk-NDI grenades are located on nearby crates. Follow the hall and turn left into an area populated by pirates. Clear the enemies on the ground level while remaining mindful of those on the walls above. Once the area is secure, drop into the yard and ascend the stairs to the next courtyard.
Nate attempts to flank the pirate on the turret.
Pirates will immediately engage Nate upon entry. Use explosive barrels to thin their ranks. Progress is blocked by a pirate manning a mounted turret on the left; use crates and the truck for cover to flank the position or use a grenade to neutralize the gunner. Once clear, enter the doorway near the turret. After defeating a shotgun-wielding pirate inside, ascend the stairs to return to the upper walls.
Follow the walkway to the tower and climb the internal stairs. Press when prompted to trigger a cutscene. In the watchtower, a Wes - 44 revolver is on the table. Use standard firearms to shoot the lock off the door, then utilize the height advantage to eliminate reinforcements in the courtyard below before moving inside.
The flooded chambers[]
Nate drops into a large, flooded hall guarded by another mounted machine gun. Quickly drop from the initial platform and use wall sections for cover, moving only while the gunner reloads. Halfway through the hall, enter the room on the right to find an M79 grenade launcher. Use it to destroy the turret.
In the subsequent chamber, three pirates ambush Nate from elevated positions. Avoid rushing into the center of the room, as this triggers additional waves of enemies from the side windows. After clearing these hostiles, two pirates armed with Moss - 12 shotguns will drop from the entrance.
Nate swims inside the flooded chambers.
Once the room is clear, use the rubble to reach platforms on a central pillar and jump to the exit passage. To progress, the water level must be raised twice. Climb the walls to reach the winches; activate the left winch first, then the right. With the chamber fully flooded, Nate can swim to the ledge and continue deeper into the fortress. The next chapter, "Unlocking the Past", begins from there.