A CR90 corvette was involved in the Defense of Ralltiir. It was helmed by Bren Derlin, who at the time held the rank of captain.
It was dispatched to the planet of Ralltiir to aid in the extraction of Ralltiir scientists who wished to defect to the Rebel Alliance, based on information supplied by Imperial TIE pilot-turned-Rebel Tycho Celchu when the latter defected to the Alliance. Late into the battle, however, it was infiltrated by stormtroopers, thus resulting in a huge firefight between the Rebels and the Imperials before being cleared for takeoff.