First Battle of the Lianna system

A battle occured in the Lianna system during the Mandalorian Wars. In 3,963 BBY, the Mandalorians began their full invasion of Galactic Republic territory, pressing out from their victory during the First Battle of Taris. One of the prongs of their asssault sent them through Lianna. The system was later liberated by the Republic.

Behind the scenes
The battle is only referenced once in 2009's The Essential Atlas. It was marked on a galactic map showing the battles of the Mandalorian Wars rather than described in prose.