Once inside the fort, your objective is to locate intelligence data. This data is typically found in the main command center or a communications building, usually located in the central part of the fort. Navigate through the various barracks and administrative buildings, clearing out mercenary resistance as you go. Be prepared for close-quarters combat in the interior spaces. The intelligence data will be on a computer terminal or a set of documents on a desk. Interact with it to download or collect the information. This will often trigger a new wave of enemies or open up a new path, so be ready for immediate action after securing the data.
