Artillery was a term used to describe medium and heavy weapons systems or vehicles designed for long-range bombardment, generally against fortified targets such as bunkers and shield generators but also vehicles and infantry. Most artillery pieces were stationary, fed by high-output power generators, serviced by large crews and protected within armored housing, although many examples of mobile pieces existed. Light artillery pieces, also known as heavy weapons or infantry support weapons, are not included in this category, nor are the immense planetary weapons used to attack orbiting spacecraft.