The starting door for the attackers is the Rapier in the NE corner of the map. The additional doors are in the NW and SW corners. The starting door for the defenders is the Tower shield, with the additional unlockable doors being further north of the Fortress.

Attackers can utilize the additional doors to bring the fight into the outer reaches of the map, into the large central bay, or even circumventing the heavy guns of the Fortress altogether. Defender positioning is more agile, with each door giving them good views of potential attacker entrance points, and easy areas to block off with a line of ships.

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