Sometime following the events of the Battle of Yavin, the Galactic Empire discovered that the inhabitants of Tureen VII were covertly offering assistance to the Alliance to Restore the Republic. As a consequence, the Empire initiated a siege on Tureen VII by implementing the blockade of Tureen VII surrounding the planet and constructing bases on the planet's two moons. The Alliance made three separate attempts to penetrate the Imperial blockade, but each effort was unsuccessful.
Ultimately, relief arrived at Tureen VII due to a rebel squad commanded by Captains Leia Organa and Han Solo. With the siege lifted and Imperial outposts eliminated, the rebels managed to flee, except for the protocol droid known as C-3PO. C-3PO was held captive by the Empire until his astromech droid companion, R2-D2, rescued him at a later point.
Subsequent to the Galactic Empire's discovery that the population of Tureen VII was secretly aiding the Alliance to Restore the Republic, they established a blockade around the planet and built bases on the planet's twin moons. The Rebel Alliance's attempts to overcome the blockade were thwarted on three separate occasions.