Varok Saurfang has served with the Horde as part of the Blackrock Clan ever since he drank the blood of Mannoroth alongside Grom Hellscream. Varok led forces in the sacking of Shattrath, Stormwind, and everything between, never losing in battle until the Horde was routed at the end of the Second War.
When Orgrim Doomhammer seized control of the Horde in the First War, he chose Varok Saurfang as his second-in-command after witnessing Varok's efficient and brutal tactics on the field. After the demonic bloodlust had been lifted from the orcs due to Grom Hellscream's sacrifice, Varok helped dozens of veterans come to grips with their previous atrocities, ultimately saving the lives of many great Horde soldiers.
Varok went on to become a famed veteran of the First, Second, and Third Wars.
I could say the same about Varian. All this 'Mighty Gladiator' talk is rubbish. He fought in about 3? matches in some comic before he escaped but people seem to think he is Russell Crowe.