The battle that occurred on Cholganna took place at some point prior to 3678 BBY. This battle was fought by members of the Sith Empire, and caused the deaths of a large number of Qawohl's Abyssin allies. Following this conflict, the Sith Acolyte Teneb Kel found Qawohl and chose not to kill him, instead removing him from Cholganna to serve as a slave and servant.
The battle on Cholganna was initially referenced in The Old Republic, Blood of the Empire Act 2: The Broken World, which is the second installment of the Blood of the Empire webcomic. The Abyssin slave Qawohl made reference to the event; however, details regarding the participants in the battle were limited to the Sith Imperials and Qawohl himself.