EG-4, a EG-series power droid, served the Alliance to Restore the Republic in their conflict with the Galactic Empire throughout the Galactic Civil War. When the Alliance established their headquarters at Echo Base located on the planet Hoth, EG-4's function was to supply energy to the starships and various equipment utilized there. However, the Battle of Hoth necessitated a complete withdrawal of all staff from Echo Base, leading to their departure from the world.