Star Wars: Battlefront II/Recovering the Plans

Capture the Barracks CP
You get to play a scene right out of the movies! Cool eh? Anyway, as soon as you spawn, the door in front of you will blow. Rebels will immediately start throwing grenades into your little boarding pod, so get moving! Eliminate resistance in the short hallway in front, then turn the corner to find a small army of Rebels. You're obviously not going to be able to take on all of them... fortunately, the Barracks CP is located off to the right side of this hall. Ignoring most enemies, just dart into the door on the right, and you'll see the command post.

There's also a medical droid to your right, and it will help you survive this. Go stand next to it, and start mowing down the enemies that come in to kill you. When they're dead, move into the center of the room and start capturing; if another wave of Rebels enter the room (which can happen more than once), retreat to the health droid again. Repeat this procedure until you capture the post.

Head to the Tech Room
Darth Vader will have been unlocked by now. Spawning as him will make the rest of this mission a lot easier (not to mention the coolness factor), so go ahead and do that. The Tech Room is located straight down the hall that was swarming with enemies earlier—enter through either of the two doors.

Destroy the Security Mainframes
There are eight of these Security Mainframes to destroy. Four are in the room you are in, and the other four are located further up the bridge. As you slash at these, remember to take some time to kill enemy troops as well; it's the only way to keep your health bar up. There's plenty of fodder in this area, so you might consider using the saber throw ability to knock out large numbers of troops at once.

Get the access codes and return them to the Tech Room
These are located on the opposite side of the map... which isn't saying much, considering its tiny size. Exit the command bridge via the large door on the right side of the ship (you can tell which is which by the orientation of the viewports), and keep going past the conference table. Follow the long hallway, take a left, and enter the door on the far left. Climb the ramp, taking out any Rebels along the way, and march forward to get to the access codes. From here it's a simple matter of backtracking to the tech room and depositing the codes at the large terminal in the middle of the room.

Find and capture Princess Leia
You'll probably be pretty low on the reinforcement meter by this point, so the quicker you can do this, the better. Get out of the tech room through one of the two doors, and head right. You'll come to another door, which leads to a funnily lit area; Leia is hiding out over here. There will be a large number of enemies here, whom you can easily dispatch with saber throw (if you lost Vader for some reason, use the Engineer's Detpacks or grenades). As you approach the Princess, keep your lightsaber guard up to defend against her powerful sporting blaster, and once you're in range just hack at her to bring her down quickly.