In a Nutshell
Luke destroys Tagge's base on Yavin, ending the siege.
Writer/Editor: Archie Goodwin
Artists: Carmine Infantino & Bob Wiacek
Letterer: John Costanza
Colorist: Petra Goldberg
Consulting Editor: Jim Shooter
Luke and Leia, stranded aboard their disabled ship, are rescued by a flight of Rebel X-wings. After sharing their intel about Baron Tagge and the means his ships are using to fly through Yavin with General Dodonna, the Rebels realize that the TIE fighters must be using some kind of device to find the Imperial station on the planet. Reasoning that the TIE which crashed on one of the other moons likely had such a device, Luke flies off with Artoo in a Y-wing to retrieve it from the wreckage. He lands near the crash, but the TIE pilot survived, and manages to blast Artoo before Luke takes him out. Later, Luke returns to the Rebel base with the gadget and the damaged Artoo. That night, General Dodonna tells Luke and Leia that they've figured out how the device works, but whomever uses it to destroy the base is unlikely to return.
Because any other pilots capable to performing the mission are needed to lead younger, greener ones, Dodonna must ask Luke to do it. Piloting a confiscated TIE fighter, Luke flies towards Yavin, activating the device to signal the base, which creates a whirlwind that keeps away all the dangerous gases. Flying through it, Luke discovers that Tagge's base is a massive turbine, which creates the whirlwinds. He quickly launches his charges, destroying the base, but then is lost in the swirling gases of the planet. Using the Force, he is able to find a way out, but unknownst to him Baron Tagge's ship escaped as well, having followed Luke out. But Tagge is nevertheless enraged that Luke ruined his chance to show up Darth Vader, and vows to do worse to Luke than Vader did to him.
Firsts and Other Notables
Artoo is damaged in this issue, not unlike the end of A New Hope; his fate is left for the following issue.
The letters page in this issue addresses the confusion over General Tagge and Admiral Motti, rightly affirming that Motti is the officer Vader Force choked in A New Hope, not Tagge.
A Work in Progress
Luke insists that a badly damaged Artoo is more than just a machine, and doesn't deserve to be broken down for parts.
In the wake of Luke's attack on his base on Yavin, Baron Tagge has developed a personal animosity towards the young Rebel.
Once again, faster than light travel is referred to as "warping".
The captive TIE fighter Luke flies to destroy Tagge's base is capable of firing proton torpedoes; TIE fighters of this vintage lack that ability.
Great splash page of the massive turbine that allows Tagge's fighters to travel safely through Yavin.
Thought it ends well, it's a shame the "Siege at Yavin" is over so soon. Between the setting, the antagonist, and the focus on Luke, this definitely reads the most like a direct sequel to the events of the film, and it would have been nice to see that extended longer (if "Han Solo and the Star-Hoppers" or "Luke vs. the cast of Space HMS Pinafore" can sustain four issue or longer arcs, surely this could, too?). But it does go out on a strong note, allowing Luke to defeat Tagge's plan but keeping the villain alive to return in the future (making him only the series second original recurring antagonist, after Valance the Hunter), now with a personal beef against Luke that should only strengthen the Tagge/Vader/Luke antagonism. Plus, Luke finds a way to deepen his connection to the Force in a way that makes it feel like the character is actually developing over time, without pushing him so far ahead as to make his training in Empire Strikes Back feel redundant.
The fate of Artoo and the return of Valance the Hunter.