Siege of Svivren

The Siege of Svivren took place in 9 ABY. It confronted the Imperial forces sent by Grand Admiral Thrawn with the locals of the planet Svivren. The Imperials were unable to win that fight

History
In 9 ABY, Grand Admiral Thrawn attacked Svivren and several other worlds alligned to the New Republic. The Imperial Navy was opposed by the locals, the Svivreni species, who disliked very much the idea of being sieged. This caught the Imperials flat-footed. After several failed attempts against the Svivreni resistance, the Imperial Navy retreated, only to return later and try to occupy Svivren. For a long time, the Imperials were unsuccessful at fighting the local resistance, and their plight was well-known enough to have reached the ears of Samuel Tomas Gillespee, by then living at Ukio.

Eventually, after Thrawn's death in the battle of Bilbringi, the Imperials retreated from Svivren. As a consequence of their fight, the Svivreni decided that their resolution was as good as a military-grade weapon, and decided to be even more determined about rejecting invaders.