The Ruisto bombardment represents a conflict that occurred during the timeline of the Galactic Civil War.
Grand Moff Therbon, in 2 ABY, had grown increasingly annoyed by his failure to recapture Mon Calamari. Because the Empire was not prepared to commit a fleet of sufficient size to attack the Mon Calamari homeworld, the Mon Calamari settlement located on Ruisto became an acceptable alternative. The Ruisto bombardment was also intended to function as practice for a future assault against the Mon Calamari homeworld.
The Empire sent an assault fleet of Star Destroyers to conduct a bombardment of Ruisto. The Mon Calamari colony was completely annihilated, and the minor shipyards orbiting the planet were also destroyed. Grand Moff Therbon then gave the command for a sustained orbital bombardment that completely wiped out all life forms on Ruisto.