The Nonnah was a Rebel Alliance transport with a central portion and two spars on the side. As part of Alliance operations on marginal worlds, it was carrying troops and stolen Imperial supplies, but was shot down by the Empire around 6 months after the pivotal Battle of Yavin. Both Rebel and Imperial forces were sent immediately to the crash site on Chorax in an attempt to retrieve the downed craft. The Empire arrived first, but the Rebellion's Rogue Squadron proved more than a match for the small force. The Rogue's A-wings competed with viper probe droids to find the downed starship. Once the Nonnah was located in a river valley, Imperial reinforcements, in the form of a Sentinel-class landing craft carrying an AT-ST, AT-PTs, and XR-85 tank droids, along with TIE Bombers were dispatched