The Long Tan was a Corellian Engineering Corporation Assassin-class corvette operated by the Dimok forces.
During the Sepan campaign, the Imperial Escort Carrier Tropsobor delivered a consignment of TIE Avengers to Admiral Harkov's flagship, the Victory-I class Star Destroyer Protector, near Gerbaud 2 the Long Tan was part of a joint Dimok/Ripoblus assault force that attempted to disrupt the starfighter transfer.
Maarek Stele's heroic performance saved the TIE Avengers, and also enabled TIE/sa bombers from the Protector to destroy the Long Tan.