Graphic Novel available from:

Comic Book series published March thru December 2006 as Rebellion #0, 1, 2, 3, 4 & 5
by Dark Horse Comics:

Synopsis:
This book collects together the following comic stories:

• Crossroads
  Tal Hesz wanted to save his planet, Jabiim, from the Empire. Instead, he found out that the Empire's cruelty has no end and he regrets helping the Imperials capture the mathematician Jorin Sol. His actions might mean the end of the Rebellion, so he decides to set things right by getting off world and rescuing his fellow Jabiimites. When he finds out the Rebellion already rescued them on Kalist IV, Hesz's conscience is now clear.

• My Brother, My Enemy
  Seeking to exploit a fatal flaw in the Rebel fleet's escape strategies, the Empire plants a sleeper agent in the Alliance's midst and sets into motion a series of events that will have devastating consequences for Luke Skywalker and his companions. Meanwhile, Darth Vader's own agenda runs counter to the Empire's schemes, and he's ensnared Lt. Janek Sunber to carry out a secret mission that will lead the idealistic Imperial officer straight into the heart of the Rebellion.
  With the Alliance desperately low on supplies, Luke Skywalker and Wedge Antilles lead an odds-off ambush against an Imperial supply convoy. Meanwhile, Rebellion strategist Jorin Sol, recently rescued from the Empire's grip by Skywalker, recovers silently in the flagship of the Rebel fleet. Yet, Sol's scars from Imperial imprisonment and interrogation run more than skin deep, and when he wakes up, supply shortages will quickly become the least of Luke's worries. And if that weren't enough, Luke's crisis is about to become even more personal when he receives a coded message from Imperial officer Janek Sunber, the man he knew a lifetime ago as his close friend, "Tank"!
  The Empire has infiltrated the command ship of the Rebel fleet with a sleeper agent-and he's just woken up! Now, the lives of everyone onboard are in jeopardy, along with the entire Alliance cause. Too bad the young hero Luke Skywalker is nowhere to be found. Having received a coded message from Imperial officer Janek "Tank" Sunber, Luke's hijacked a shuttle against orders, determined to find his old friend-even if it means delivering himself straight into an Imperial trap!
  Luke Skywalker faces a squad of stormtroopers when he attempts to bring his boyhood friend Imperial officer Janek "Tank" Sunber over to the Rebellion. Was Tank's plan to defect discovered by the Empire before he could get away, or are the troopers a plot to trick the Alliance into letting Sunber into the heart of their operations? It might not even matter, because while Luke is off on his renegade rescue mission, the Rebel Fleet comes under attack-from inside the command ship!
  With the entire Rebel fleet under siege by a massive Imperial force, Wedge Antilles and Red Squadron launch a valiant defense, but even they know if the fleet doesn't figure out an escape plan soon, there won't be anything left to defend. Meanwhile, chaos reigns on the Rebel command ship as a threat from inside continues to have devastating consequences for the Alliance.

Related Stories (in chronological order):

• Last Stand on Jabiim by John Blackman et al.
• A New Hope by George Lucas
• To The Last Man by Welles Hartley et al.
• In The Shadows Of Their Fathers by Thomas Andrews et al.
• The Wrong Side of the War by Welles Hartley et al.
• My Brother, My Enemy
• Rebellion by Rob Williams et al.