Hell. That is what war can be called. I have served as a peon in the wars of the Human and Orcs. It is fair enough that I fill you in on why.
I was a warrior of the Thunderlord Clan of the Blades Edge Mountains. The war that consumed our race forced the Thunderlords and the Shadowmoon clans to rip themselves apart trying to kill one another, oftentimes that is indeed not an exaggeration. To tell the truth of it, I was forced into submition by Ner'zul himself. Terron Gorefiend had indeed done his work, for the shady dealings of the Death Knights paid there toll upon my clan. The Mok'nathol were of course no help. Arrogent bastards that they are, they left us to our fate. I swore vengeance.
As a peon for the Shadowmoon Clan, I learned the ways of Shamanism and the demonic ways of the Warlock through mere observation. Observation is a good way to go about things until you try to mimic what you see. It wasn't a total loss. Through the experimentation of sorcery, I found eternal youth. It was no secret that warlocks can indeed live forever if they choose.
During a raid by the ogres come for food, by that I mean orc flesh, I was forced to wield the only weapon that I had at my desposal to stay alive. My Pickaxe. I learned the ways of the warrior through combat. I was enthralled so much that I rose up against my masters and finally managed to escape. I waited and watched, eating boars and bears. When the portals were opened, I made my way through and commenced doing what I could do to survive: Kill the Humans.
Doomhammer came across me one day while foraging and he took me prisoner. I was forced to mine gold, cut lumber, and build his buildings. Confidence was his downfall. After Gul'dan sought out the tomb of Sargeras, I made my escape yet again while the majority of the army was away.
I wandered for a decade or so, fighting for survival and hoping one day a war chief would arise to treat me fairly. Then came Go'el. The humans know him as Thrall, Son of Durotan. I know him as brother.
I was given a chance and was sent to the Valley of Trials. But that is another story for another day.