Uncle Owen? Aunt Beru?

Little is known about the causes or events of the Silvart War (シルバルト戦域 Shirubaruto Sensō).

Fiction

Japanese Generation 1 cartoon continuity

Victory cartoon

After Deathsaurus was defeated and his Planet-Destroying Fortress destroyed, Greatshot returned to life as a mercenary and was last seen fighting in the Silvart War. Showdown! The Fortress vs the Victory Unification

Legends comic

Greatshot would be gravely injured in the Silvart War, but was saved by his Autobot and human friends. Bonus Edition Vol. EX

Animated cartoon

Land General Sideways led the Decepticons in the Silvart Wars. Primal Major and the mighty Alpha Supreme would prove instrumental in winning the wars for the Autobots, and captured Sideways at the end of it. The AllSpark Almanac II