"Yet there are many that cry in the Dunland tongue...I know that tongue. It is an ancient speech of men, and was once spoken in many western valleys of the Mark. Hark! They hate us, and they are glad; for our doom seems certain to them. ... They are a fierce folk when aroused. They will not give way now for dusk or dawn, until Theoden is taken, or they themselves are slain."
Dunland Spearmen are only available through Wulfgar's level 5 ability, Spears from Dunland. If the Uruk Pit is still level 1 and therefore Uruk Pikemen are not yet available, Dunland Spearmen can serve as Isengard's early pikemen.