<P> Walkers are vehicles from the Star Wars universe that traverse the landscape on mechanical legs . They are used by the Old Republic and the Galactic Empire for ground assault or transport . Throughout the saga, walkers have played a pivotal role in the fate of characters and the outcome of battles . Industrial Light and Magic (ILM) is responsible for their animation and design, often using models, stop - motion animation, and relevant matte paintings to depict their presence in the films . </P> <P> There are a variety of walkers: The Empire Strikes Back introduces the All Terrain Armored Transport (AT - AT) and All Terrain Scout Transport (AT - ST). Star Wars: Episode II--Attack of the Clones and Star Wars: Episode III--Revenge of the Sith introduced earlier models of walkers, such as the AT - TE, and the Star Wars expanded universe features numerous others . Walker variants have been merchandised and featured in popular culture . </P> <P> The All Terrain Armored Transport, or AT - AT walker, is a quadruped mechanized infantry combat vehicle used by the Imperial ground forces . Standing over 20 meters tall with blast - impervious armour plating, these massive constructs are used as much for psychological effect as they are for tactical advantage . </P>

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