Warcraft: Orcs And Humans -

: Despite their valiant efforts, the kingdom could not hold. Garona Halforcen , a half-orc spy who had gained King Llane’s trust, assassinated him, leading to the total collapse and destruction of Stormwind. The Orcish Perspective: Conquest and Victory

: 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 Warcraft: Orcs and Humans

The war was not a random occurrence but the result of a long-term plot by the fallen titan , leader of the demonic Burning Legion. : Despite their valiant efforts, the kingdom could not hold