When you mass, the units in the fortress you are attacking will attack to the end of it. Units on the map will attack to the entrance of the fortress.
To control gates or to mass at Helms deep or Edoras, look to the right of the fortress. For Orthanc or Lorien, look to the left. [Note: There is a slight bug with Orthanc massing. Units will clog when they try to climb the tower. I suggest you mass manually.]
To win, kill all of the enemies Main spawns and Main heros.
Red - Theoden/Edoras
Blue - Eomer /Helms Deep
Teal - Heros
White - Haldir/Lorien
Purple - Saruman/Orthanc
Oj - Lurtz/Orthanc
There are more additional features and secrets in the map, so enjoy!
Attachments:
None.