Raid At Hillsbrad Horde Tides of Darkness Mission 2
- Rescue Zul'jin
- Bring him to the Circle of Power
All you need to do for this mission is travel to the north and break Zul'jin out of his prison then bring him back to the Circle of Power. You technically start with enough units to do this and don't even need to make a town or farm resources... But assuming you make a few mistakes and you're still learning the game, I would recommend making a town.
Build a Barracks and a few units then head up north once you feel ready where you will find Zul'jin and a few other troll units. Once you have them in your control take them to the Circle of Power to complete the level.