Enable Paladins: 
     At  the Detatchment screen, hold down CTRL and type in Paladin to
enable knight paladin units.

Various cheats
     During battle, hold down CTRL and type:

Cheat code:             Effect:
EYEOFTERROR             show all enemy units
HERETIC                 complete mission
CLEANSINFIRE            hit probabillity increased to 100%
WHITEDWARF              all units invulnerable to ranged weapon fire