The Rebel Alliance relocated to Hoth after their victory in the Battle of Yavin. However, an Imperial probe droid discovered the base on Hoth, but was itself discovered, and the Rebels began preparations to leave, although an Imperial Death Squadron arrived too soon, and the Rebels were forced into combat.
The action on Hoth figures prominently in the opening of Star Wars Episode V: The Empire Strikes Back.
Hoth is an example of the science-fictional stereotype of a planet that has only one climatic zone. Ice worlds could exist primarily because arctic regions differ little from one another. Barring recent orbital changes, a planet like Hoth could not support life as without photosynthesis on a planetary scale the ecosystem would collapse due to the inherent inefficiencies of biological activity consuming the existent biomass and its stored energy. The tauntauns where obviously endothermic ( breath fogging up ), and so even if the wampas were exothermic, the biome would gradually lose energy that would not be replenished.