If Orcs are the foulest creatures to walk Middle-earth then the Uruk-hai are the most dangerous perversion of the breed. Where ordinary Orcs are crook-limbed and timid, the Uruk-hai are strong, muscular, upright warriors of greater skill and courage.
The armies of Harad often employ Mûmakil, massive war-beasts trained by the Mahud, to trample their enemies under colossal hooves. A Mumak is nigh unstoppable once it begins its charge, tossing aside enemies like broken dolls.
Wargs are gigantic, evil wolves - massive and dangerous creatures with a cunning and carnivorous intelligence. Warg Riders scout far ahead of the main armies of Orcs and other evil creatures, spying out the land and picking off stragglers. In battle wargs swarm towards the foe in great packs, tearing the enemy down with bestial fury.
Minas Tirith's armies are the greatest of all the realms of Men - disciplined, superbly equipped and led by veterans of the wars with Harad and Mordor. Each warrior in Minas Tirith's army is trained to wield a variety of weapons, from the humble sword or bow, to the deadly knight's lance.
The Ringwraiths, or Nazgûl, were once the Kings of Men, the bearers of the magical rings created by Sauron. Their rings granted endless life but gradually enslaved the Kings to Saurons will. Together with their leader, the Witch-king of Angmar, they are known as the Nine and are the most deadly of Sauron's servants.