The Lord of the Rings: The Battle for Middle-earth Cheats

Bypassing the command point limit
If you have reached your command point limit during a mission, send out a battalion or two (with the Banner Carrier upgrade) of soldiers. Have them fight until there is only one or two men remaining in the battalions/hordes. Then, send them back to your base, near a Healing Well for the Good side. You have just freed up several command points. Your damaged battalions can regenerate. Use this strategy to make up to three battalions of cavalry to raid your opponent with.

Defeating Ents
Train a horde of Archers and give them the Fire Arrows upgrade. Send them and shoot the Ent until he is on fire, then run away. He will die in a short time.

Defeating Isengard
When you are fighting Isengard, either use Summon Rohan Allies or start out as Rohan. Build a stable and a lot of farms. Close the main gate and build a Postern Gate instead. Build an army of Riders Of Rohan and walk over the Uruk-Hai's. To counter battering rams, use Yeoman or Elven Archers. To counter Warg Riders and Siege Ladders, use Heroes or Sentry Towers. Note: With the riders, just ride over the Uruks. It will either kill or stun them for you to finish. With the riders, try summoning Eomer to the field and give them a bonus or two.

Defeating Rohirrim
When Isengard, Pikeman can easily defeat Cavalry if their numbers are similar. However, by combining a Pikeman horde with a Crossbow horde you can have one of the most powerful anti-Cavalry groups there are.

As Mordor, there really is no cheap way to deal with Cavalry. Trolls and Mumaks are your best bet, considering they have heavy damage with little harm done to them. Try getting creative and putting Orc Archers with fire arrows inside the Mumakil. This can make for a devastating blow to even a castle, and not just enemy soldiers.

Defeating Trolls
Make a horde/battalion of archers and give them the Fire upgrade. Shoot the troll until it catches on fire (like Ents), then run away. The troll will die very quickly.

More powerful creatures
To make a Troll more powerful, have it pick up a tree as a club. It is slower, but much more powerful. To make an Ent more powerful, have it to pull boulders out of buildings or rock piles to throw at enemies. This is a very powerful long-range attack.

General strategies
1. Hordes/Battalions with a Banner unit should be retreated when only a few remain to allow the ranked unit to regenerate.
2. Try to grab as many of the economy/outpost plots surrounding your base.
3. Always close your Castle Gate and build a Postern Gate instead.
4. Build two economy structures per one unit production building.
5. Fewer upgraded units are always better than many non-upgraded units.
6. Build economy structures in the back of the Camp/Castle and build unit production structures in the front.