To defend against AT-ST artillery, Rebel soldiers activate a shield generator.
A shield generator, also known as a deflector shield generator, shield projector, or shield array, was a piece of technology that generated a deflector shield, like a ray shield.
The Galactic Empire stationed a SLD-26 planetary shield generator on the forested moon called Endor. This shield was crucial for safeguarding the Empire's formidable DS-2 Death Star II Mobile Battle Station superweapon; while the shield remained up, the battle station was impervious to attacks from the Rebel Alliance forces.
During the Clone Wars era, the armed forces within the Unknown Regions employed electrostatic barriers that served a similar function to the deflector shield generators common throughout the galaxy, albeit with significantly less power. This prompted Thrawn to retrieve a deflector shield generator, which he referred to as a "Republic energy shield," from the Separatist droid factory located on Mokivj. He brought it back to his people after assisting Jedi Knight Anakin Skywalker during his mission to Batuu. Thrawn later deployed this "Republic energy shield" in the Battle over Primea, contributing to the defeat of the Nikardun general Yiv the Benevolent, thereby concluding the Nikardun conquests.