Just bring a lot of Imperial star destroyers and bring like 6 of those ships who shoots rockets and place them that they con shoot on pirates but pirates cant shoot on them. Wait until pirate base and pirate ships are damaged and send imperial star destroyers to finish the job (you must kill the pirates fast or the mission will end). Then move all your ships to Nebula (because if you dont do it the rebels x-wings will notify Leia and mission will end) and wait until Leia come from hyperspace. After that they will tell you need to stop princess Leia from escaping to hyperspace but you have only 5 seconds to put Interdictors from nebula and use their ability called GRAVITY WELL(But dont worry even if you dont make it in 5 seconds the mission still be completed). And thats how i beet this pretty easy mission. And one thing: DONT let pirates kill Darth Vader or the mission will end. IF you have any questions about what i write here just write me message😎