In the galactic standard year of 13 BBY, the world of Tervissis was attacked by the military of the Galactic Empire. This attack was not the first Imperial presence on Tervissis; five years prior, the Empire had executed raids as part of the Listehol Campaign, an operation intended to eliminate Tervig enslavers, Zygerrian slavers, and Sikurdian marauders from the Listehol Run and the Shaltin Tunnels hyperspace lanes.
This invasion was initially referenced within The Essential Guide to Warfare. This comprehensive guide, concerning the wars and battles of the galaxy, was authored by Jason Fry and Paul R. Urquhart and published in 2012. The book did not detail the outcome of the invasion.