Press CTRL + SHIFT + 1 to open the cheat console and enter the codes below for the desired result.

SetSpeed - Sets speed of the given unit type, where unittype is a number, indexing a list of all unit types (??)
GetSpeed - Displays the speed of the given unit in battle (player 0 is the human player)
Artifact - Adds or removes an artefact to/from a hero ( name preceded by "gp", ie. "gpBalin" or "gpDamas"). See below artefact names.
SetXP - Sets XP of the hero.
AddXP - Adds XP for the hero.
AddUnitXP4Army - Adds XP to the units of the given army.
net - Multiplayer only / drops connection or forcing reconnection
GiveVP - Adds victory points to the player
GiveVPTreshold - Adds vp threshold to the player
GetStrength - Displays three strength value of the given unit
SendCamera - Multiplayer only / send the actual camera position to the peer
Chat - Multiplayer only / sends a chat message to the peer
GivePoints - Battle / gives hp or mana to the given unit
SpawnQuest - Strategy map / spawns a quest to the given hexafield (quest names are language dependent)
FinishActiveQuest - Finishes active quest (you get no rewards, and this can leave you with an unfinishable game!)
GiveArtifact [] - Gives an artifact to the hero (or chooses randomly if you don't specify one)
AddSkill [] - Grants a skill to the hero (skill names are language dependent)
GiveLady - Grants brides to the player
GiveArmyUnit - Spawns a new unit into the army of the given hero (see below soldier types)
GiveFaith - Gives faith to the player (range of faith / -20 to +20)
GiveVirtue - Gives virtue to the player (range of faith / -20 to +20)
GiveMoney [] - Gives some money to the ruler (if not specified than to the player)
GiveFood - Gives some food to the player
AutoBattleGodMode - Sets god mode in autobattles
ContractPassthroughStatement - Forces contract of a passthrough statement between the player and the given ruler
DeclareWarToHuman - The given ruler declares war against the player
DisableArcheryDamage - Disables all archery damage
EnableArcheryDamage - Enables archery damage
KillAll - Battle / kills all units of the player
WinBattle [] - Battle / given player wins the battle (assumes 0, the player, if not given)