The Mountain Goat was a notorious warrior who was very accomplished in battle. Alongside the Revolutionary Army and the Order of the Black Knights, he defeated 900,000 of Esdeath's troops using nothing more than the mountain's environment; one of the methods used was a bomb that caused an avalanche. He also took down a Voth fortress ship with the help of Night Raid.
The Mountain Goat was created in 2685 by the Solanae. He was a duplicate of Treav, believed to have been created in a similar fashion to Riker's transporter duplicate. For this reason, Treav was falsely accused of being the Mountain Goat in 2700. Howlingmoon and Tuvok fortunately managed to prove that he was not.