The First Battle of Raxus
The First Battle of Raxus, also known to Imperial troops as the Raxus Massacre, took place in 18 BBY between the Galactic Empire and the Confederacy of Independent Systems, and was the first battle of the short lived Separatist-Imperial War. The Confederacy caught the Empire by surprise and completely decimated the entire Imperial fleet, with the exception of the Devastator, Lord Vader's flagship.