When Rogue Squadron traveled to Jol Allson's trial on Bilbringi, they were attacked by mysterious smugglers which very nearly destroyed Ashleigh. The New Republic later found out that these pirates were operating in the Unknown Regions, and had hold of Goa'uld technology. Rogue Squadron was tasked with destroying them.
While the Dar'hen made use of starfighters, the Rheilnor group seemed to invest heavily in capital ships. They were in possession of two Dreadnaughts, a Bulk Cruiser, a Kaloth Cruiser and a dozen Marauder Corvettes. For starfighters, they relied mostly on uglies named TIE-Wings, and a few Y-Wings.
The location of the base was discovered to be a planet the pirates has named after themselves, and Rogue Squadron headed there to find nothing at all. The pirates were in fact using cloaking devices to hide several Dreadnaughts and a salvaged Goa'uld mothership.
Rogue Squadron stormed the surface, but a a single corvette managed to escape, meeting more ships in orbit before entering hyperspace. Rogue Squadron pursued them into hyperspace, coming across the forgotten planet of Adumar, where local forces helped destroy the pirates once and for all.