Blizzard Force
this was the name given to the amassed Imperial ground force that was dispatched to the planet Hoth, during the Empire's attack on the Alliance's Echo Base. Led by the group of Imperial AT-ATs and AT-STs which served as the lead wave of the assault on the Alliance's main generator, Blizzard Force also included a division of Imperial Cold Assault stormtroopers, they are trained to work in tandem with AT-AT assault vehicles. The Blizzard Force walkers proved too much for the Alliance forces, and precipitated the Imperial victory in the Battle of Hoth. The victory was sealed when the Cold Assault troopers breeched the gates of Echo Base's icy caverns, forcing the Alliance personnel to flee aboard their meager transports.