Various cheats:

Code                            Result 
gimmemorefirepower              Firepower 
goldinmypockets                 1000 Gold 
iwantfastfood                   1000 Food 
icanwineverythingnow            Win the Level 
iwantareallybadguy              Billy the Kid 
iwantareallystrongher           Gall 
woodisverygood                  1000 Wood 
icangeteverything               5000 Food, Wood, Gold (100 Guns, Horses)
horsesarecrazy                  10 Horses 
iwantanamericanhero             David Crocket 
cpuon                           Enable AI 
cpuoff                          Disable AI