Self-Propelled Heavy Artillery/Turbolaser

The Self-Propelled Heavy Artillery (SPHA) walker was a modular heavy artillery unit used by the Grand Army of the Republic during the Clone Wars, and by the Galactic Empire afterward. It bore a resemblance to the smaller Republic stun tank also utilized during the Clone Wars.

Description
A Self-Propelled Artillery Walker (SPHA) had twelve legs that served as mobile support structures. Unlike smaller walkers, such as the AT-TE, SPHA units were unable to be carried into battle by LAAT/c gunships because of their large size and weight. Instead, they were deployed directly from landed Acclamator-class assault ships, which could carry 36 of the artillery platforms.

The SPHA walker chassis served as the basis for a number of different weapons platforms, though the best chronicled version was the turbolaser (SPHA-T) configuration. This variant's main weapon was a heavy turbolaser cannon, capable of causing extreme direct fire damage to large or slow-moving targets. The turbolaser boasted tremendous range and was capable of penetrating deflector shields.

The primary disadvantage of this powerful weapon was that it was incapable of providing indirect fire support to out of sight locations, a problem remedied in other models. Another disadvantage was that the weapon could only be charged to a certain level—upon firing such shots, they had to be replaced with charged guns from the rear lines.