High ground if you can.
Young orcs tend to be quite vulnerable to archery and can be kept at bay with the spearwall somewhat. They also panic and run if you kill several of their buddies, letting you concentrate on the big brutes.
Orc warriors wear heavy armour, stab thm like a sneaky douchebag with scramasaxes or daggers that go stright for health, ignoring armour and whack them from afar with billhooks.
