The story of (commonly known as the First War ) centers on the sudden, violent clash between the noble Human kingdom of Azeroth and the invading Orcish Horde from the world of Draenor.
For the Orcs, Azeroth was a new world to conquer as their own home, Draenor, was dying. Warcraft: Orcs and Humans
The Humans of initially viewed the orcs as mere "beasts" or "monsters" from the swamps. The story of (commonly known as the First