Hey, This strat only really works on helms deep and minas morgul but anyways....
If you r mordor get ur ally or allies to attack the front gate with a huge force, the point of this is to make the illusion of a full main attack but why this is happening the enemies forces should be drawn to the front gate this is when u attack the wall with seige tower then catapults and try and take over the lower level and build a base.
STAGE 2 -Building A base
When u build a base in the lower level buiild towers and fortresses if u hav enough dough, (if in minas morgul destroy catapults )
STAGE 3 - FIANAL ATTACK
Get ur allies to attack the front gate at helms deep adn break though then as they break the gate u shud seige though from the other side with mordor and re-group with other forces and attack fortress, if in minas morgul attack different gates and keep spamming haradrim/easterlings or attack trolls....
This is quite an effective stratergy and always works with me..
(Hint) - Pretend to say stuff out loud like (eg. Remember attack the left wall he wont expect it) this usaully works on n00bs but not as well on higher levels.
[][] [] [] VERY EFFECTIVE WITH MORDOR [] [] [][]