So you want to be a black orc? First, it is very important to know that Black Orcs can only attack enemies that are close by. They are barbaric sort of fighters, who will not stop attacking and crippling the enemies. That said, Black Orcs are not ranged fighters, and do not make the mistake of assuming that they can take down several enemies at once.
Always best suited at the front, it is a bonus to have the Black Orcs as fully armored as they’ll face the enemy for your entire pack. What’s the use of having a big defensive unit in your army if it remains at the back, while the rest get bashed up?
The Black Orcs’ style of attacking makes the enemy unfit to fight, in essence disabling them. As they constantly attack the enemy with unexpected blows you may notice that their biggest advantage is the building chain of brutal attacks, one leading into the other until they are victorious.