Battle of the Vena system

This battle took place in the Vena system in 3,962 BBY as part of the Mandalorian Wars, a conflict between the Galactic Republic and Mandalorian Neo-Crusaders. The battle took place because the Mandalorians campaigned to take control of the Core World of Duro. Called Mandalorian Triumph, this charge took the Mandalorian forces from their territory through the Nazzri system. Passing through the planet of Onderon, which they had taken earlier in the war, they continued to the Vena system and won the battle there before leaving to conquer the Ambria system. Once the Mandalorians had taken that system, they continued coreward until they reached the planet of Exodeen, which they used to stage their successful capture of Duro.

Behind the scenes
This battle is only referenced once in The Essential Atlas. The battle was marked on the galactic map showing the battles of the Mandalorian Wars rather than in prose.