Attack on Phoenix Squadron (3 BBY)

In the third year before the Battle of Yavin, the Galactic Empire mounted on attack on rebel fleet in deep space. The fleet was waiting for fuel to be delivered by the crew of the Ghost before it could jump into hyperspace en route to the Yost system, where the rebels intended to set up a base. They soon learned, however, that the Yost system was under Imperial control and the rebels would be jumping into a trap. With the help of an Imperial inventory droid named AP-5, the rebel astromech droid Chopper was able to discover a new location: Atollon. The rebels jumped away from the attack and arrived safely in Atollon.