20000 Extra Money
Press ~ (tilde) while playing the game to open up the console. Then, input the following cheat code: add_money 20000
44% success rate. 

Walls Fall Down in Seige in Battle Map Mode
Press ~ (tilde) while playing the game to open up the console. Then, input the following cheat code: jericho
33% success rate. 

10% Cheaper Units in Campaign Mode
Press ~ (tilde) while playing the game to open up the console. Then, input the following cheat code: gamestop

Bigger Elephants in Campaign Mode
Press ~ (tilde) while playing the game to open up the console. Then, input the following cheat code: oliphaunt
0% success rate. 

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