Around 3 ABY, a small contingent of Rebels laid in wait and attacked an Imperial group of transport vessels along the Corellian Trade Spine, ultimately stealing a vital part needed for the second Death Star's weaponry.
Wolf Squadron of the Rebel Alliance initiated a surprise attack on an Imperial convoy that was traveling close to an asteroid field located on the Corellian Trade Spine.
In the midst of the combat, Rebel troopers made their way aboard the cargo ship, eliminated the stormtroopers stationed there, and then piloted the ship into the asteroid field, eventually landing it at their secret base situated on Annamar.