Cheat Codes
While in the detachment selection screen, hold down the [ctrl] key and type:

Paladin-This ables you to use Knight Paladin units.
During the battle, hold down the [ctrl] key and type:

CLEANSINFIRE-Your hit probability is increased to 100%.
EYEOFTERROR-To be able to see all enemy units.
HERETIC-Completes the mission.
WHITEDWARF-Makes all your units invulnerable to ranged weapon fire, not close combat.
P.S Control makes the selected unit fire so try to select a unit that has fired or it cannot fire.