Montalban's Fortress

Montalban's hideout, or fortress, is unlocked by defeating Montalban enough times to figure out where his fortress is, relative to the map pieces you find after defeating Montalban in his ship. Upon finding his fortress, it will trigger a land battle, similar to a Raid. The enemies fighting against you in that raid are natives. If you win that land battle, you trigger a Fencing battle. Upon winning, an animation plays where you, the Protagonist, initiate a sequence of attacking with your swords, and you hit the Marquis with the pommel of your sword, knocking his into the air, and then you make a V-shape around his neck, forcing him to surrender.