Beat the game, then save when prompted after the credits. You can now play any stage in the completed campaign with the stats you had at the end.
Additional Characters :
Have a completed saved game from Kingdoms Under Fire: The Crusaders on your hard drive. Gerald, Lucretia, Kendal, and Regnier from the first Kingdoms will be available in custom missions.
Unlockable Characters: Beat the campaigns on the left to unlock the ones on the right.
|Walter's or Leinhart's campaign||Cirith|
|Rupert's or Cirith's campaign||Morene|
Thanks to Revolution reader heromonster, nifeeeter!