Lesson four – Use controller rooms for ambush. Other than the island dungeons, where controller guards are responsible for killing off entire parties, the regular dungeon controller guards really aren’t that strong compared to people in the siege.
So why bother protecting a controller room if that controller room isn’t vital? It can be used for ambush. You hide a party in a side room of the controller (if the map allows), wait for the enemy to capture the controller with little conflict (have one or two people protecting it). Once they capture the controller and main forces start moving, attack the controller guardians and the people guarding the controller from the side. This should be a quick victory because typically the controller guards are spawn buffer/healers. The enemy’s advanced forces now face a sandwich of your troops (your defending line, and the party that took the controller).
Camps are hard to break, but if it’s a room with 3 portals, could be possible. First I set up my large forces on the entry-point, to prevent enemies from advancing without running into my ambush. Then I send a small force in – 3 or 4 people at most. Their speed is more important than anything else.