A multitude of Orcs have laid siege to the fortifications at Hellfire. Although the attacking warriors are not well equipped, their sheer numbers may spell the downfall of our forces there.
You must take command of the Alliance armies at Hellfire and break the siege before our troops are pushed back through the Dark Portal. We must withstand their charge long enough for the Book of Medivh to be recovered and the rift forever sealed.
The Bonechewer clan's AI is scripted to spam poorly-upgraded basic units, as indicated by the mission briefing. The Shattered Hand and Thunderlord clans have more traditional behaviors, being able to use advanced units like (respectively) death knights and dragons.
While the mission objectives make it sound like you only need to survive until the Orcs give up, they actually never do this, so you must destroy all enemies to win.
The mission is supposed to consider the Orcs "forced to retreat due to lack of resources" and award you victory if every CPU-player has 400 gold or less each but due to some oversights, the check doesn't ignore players who are either no longer in play (whether they were wiped out before their gold runs low or, in the case of Red, immediately joining you) or non-existant (the case for Orange, Black, and Yellow), thus it will always see at least 4 CPU teams with the 5000 gold they started with.
The Heart of Evil
Alterac
Footmen
Archers
Knights
Ballistae
Demolition Squads
Flying machines
Gryphon riders
