Tauntaun Troopers saw frequent use during the events leading up to and during the Battle of Hoth, with their purposes including scouting and also battles.
Tauntaun troopers made their first appearance in Star Wars Episode V: The Empire Strikes Back in the beginning of the film. Their role was somewhat expanded in Star Wars: Galactic Battlegrounds as a mounted infantry unit for the Rebel Alliance. Due to gameplay purposes, all mounted infantry within the Rebel Alliance were of Tauntauns, even in areas where they shouldn't thrive in.