The battle of Bresnia was a battle of the Galactic Civil War.
The battle
Sometime after the Battle of Yavin, Rebel agent Karlon was killed in a battle against Imperial forces on Bresnia.[2]
Aftermath
After his death, Karlon's best friend, the Carosite medic Tamo Lan, took charge of his seventeen-year-old sister, Gondara. The Aqualish teenager, who had been living on an Alliance safe world while her brother fought for the Rebellion, subsequently entered active duty and became a member of Shroud Team.[2]
Sources
"Cracken's Rebel Operatives" — Star Wars Adventure Journal 10 (First mentioned)- The Essential Atlas