User blog comment:Spawny0908/UPDATE!!!!: The Free DLC pack is coming in...../@comment-2086180-20110906141441/@comment-10278667-20110907031912

Also because in Stronghold you have to capture multiple objectives. I don't think there's enough room for stronghold to work at El Presidio.

Of course, they could always include Diez Coronas into the map, so the attackers have to work their way towards the fort. Might get boring, though, fighting your way through an open field.