337 was a pair of Imperial Corellian Engineering Corporation Assassin-class corvettes involved in supplying Admiral Wooyou Senn's Task Force Vengeance in the Outer Rim Airam sector. As part of a convoy making its way to a hyperspace transit point, the ships of 337 group were inspected by a flight of Rebel Alliance A-wings on a scouting mission. This revealed that these modified corvettes appeared to be carrying power cells. The A-wings then proceeded to destroy these vessels.