The clash known as the Battle of Panna took place on the world of Panna during the Pre-Republic era. This conflict pitted the Kingdom of Cron against the pirates commanded by Xer.
As Xer's Kingdom of Argai began aggressively expanding inside Cron's territory, Ferece, the King of Cron, invited Xer to Chandaar, Cron's capital. Ferece attempted to convince Xer to pledge allegiance in exchange for several noble ranks. Xer pledged to return within a month bearing an appropriate tribute. However, Xer instead amassed a considerable fleet at Panna and launched an assault on Ferece's military forces. After this engagement, Xer attacked Duinarbulon.