The Humans of initially viewed the orcs as mere "beasts" or "monsters" from the swamps.
While the game features two separate campaigns, the is the canonical ending that sets the stage for the rest of the franchise. The Origins: A Dark Pact
For the Orcs, Azeroth was a new world to conquer as their own home, Draenor, was dying.
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.
: Led by King Llane Wrynn and champion Anduin Lothar , the humans fought to protect their peaceful lands.
: Under Doomhammer’s leadership, the Horde successfully sacked Stormwind Keep, securing their dominance over the southern reaches of the Eastern Kingdoms. Canonical Aftermath
: Sargeras possessed the human sorcerer Medivh in Azeroth. Together, Medivh and Gul'dan performed a ritual to open the Dark Portal , a dimensional rift connecting their two worlds. The Human Perspective: A Kingdom Under Siege