Cheat List
At main menu press shift + alt + a. Now in game press:

ALT + X ... Increases popularity by 100 and money by 1000.
ALT + C ... Cycle characters or unlocks all missions.
ALT + K ... Destroy enemy fortress.
ALT + Z ... Destroy selected enemy.
ALT + G ... Destroy main stronghold.
ALT + D ... Engage debug mode.
ALT + P ... Increase character's level.
ALT + F ... Upgrades and purchases become free.
ALT + S ... Time shift.
ALT + Q ... Time compression engaged.
ALT + Y ... All enemies on screen turn into butt sauce.

Submitted by Johnny Boy, omarkhaled_2002_2
All (Unverified)

Cheat: Make your Own Taunts
First, go into C:\Program Files\Firefly Studios\Stronghold Crusader\fx\Speech or wherever you installed Crusader. You will find a bunch of sound files. You need a microphone to do this. To make this easier, put the list of files in alphabetical order. Now, scroll down to the file Insult1. Insult1=F1 and you get the idea. (You can double click to listen to the file). Now right click on Insult1 to bring up a menu. Look down the list and find, "record". Click on that and it should bring up the sound recorder. Press record, record what you want to say and click stop. Instead of going to file save, press the close box and it should come up with a message stating the directory of the file changed and it will ask you if you want to save the changes. Click yes. Now, you can go into the game, press F1 and you should hear your recording. You can also do this with any other file in the speech folder. Note: Be aware that you can't change the file back to its original voice unless you reinstall the game. This is based on Windows XP and it might not be the same on Windows 98. etc.

Hint: Hold Enemies Captive Inside Their Own Castles
Take a small building such as an Oxen Tether. Place 1 or 2 of them right outside the gatehouse(s) of your enemy's castle, but make sure their keep is enclosed first. Immediately put the Oxen Tethers to sleep. The ground troops will walk to the gatehouse to destroy them but they can't get through, so they just walk back to their spot. Your enemy's buildings outside of the castle will spontaneously crumble because the workers can't get back inside the castle. Also, the gatehouse(s) you blocked might spontaneously crumble after a while. Soon there will be no food and the peasants will leave the castle. The small army will be trapped inside their own walls awaiting your arrival. When your army is built up, you can just waltz over and wipe the whole castle off the map. (Note: Make sure there are no enemies outside of the castle, or else they will probably come and destroy your oxen tethers.

Hints
After finally beating the Crusader Trail challenge, here's some tactics that work well. See the above tactic for using an ox tether to block the enemies gate, but only use this on particularly difficult boards as you will not be able to collect stone.

Starting tactic, set game speed to lowest possible setting and spot your initial towers and crossbowmen. Put speed back after to preferred setting after you're set up. Defense is the first priority at all times. If you can defend then you can later go on offense.

Do not get locked into the concept of enclosing your castle. Quite often the best tactic is to surround your village area with towers filled with crossbowmen and ballistas. After filling the tower, delete the bottom step, enemy forces cannot get in and they won't try to tear it down either. You can always put it back in to send up reinforcements.

Leave an opening in your castle walls, heavily defend the opening. Attackers will gravitate to that opening, leaving the rest of your castle clear with walls that don't require defending. Make a death pass between two walls at that openeing, funnelling the enemy into a narrow place filled with swordsmen or pikemen.

Enemy towers that have seige engines can be taken out with the Assassin. Sneak him to the tower and let him kill the engineers. Use fire ballistas to burn the enemies farms, he will spend resources on replacing them instead of making new soldiers.