The Obran Cluster, a collection of asteroids, served as a concealed storage site for the Rebel Alliance's warhead-filled cargo containers. The Imperials, having discovered this, strategically positioned a minefield there, plotting to ensnare the rebels in an ambush to both weaken their forces and seize the warheads. Notwithstanding the minefield and the lurking Imperial Assault Gunboats prepared for an ambush – a situation the rebels were completely cognizant of – they dispatched A-wings to clear the mines and endeavor to delay the Imperials, allowing their Beetle flight group's Heavy Lifters sufficient time to retrieve the containers.