Star Wars: Battlefront II/Underground Ambush

Assault the Lookout Command Post
How many steps can they break this into? All you have to do for this objective is get within range of the Lookout CP, marked by the yellow arrows.

Capture the Lookout CP
You should have no problem at all with this objective, there will be maybe 2 units at the top of the structure when you get there, dispose of them and capture the CP.

Capture the Highway CP
This is where it starts to get tricky. Move up the road with your units, paying attention to any mines that may be in the road. Methodically eliminate any enemy units that try to stop you, and don't ignore any of them. When you get a little bit closer to the CP, opposing units will try to stop you with AATs. The best way to survive against these is to position yourself so that there is an AT-RT between you and the AAT. When the CP is taken, the tanks will disappear.

Secure Hangar 10's CP
Use Obi-Wan Kenobi to first remove any enemies around the CP you just captured, then move in to the hangar. Don't worry too much about enemy fire, just stand next to the CP and press the "block" button ("F" on the default PC controls). This will block all enemy fire from the front and sides. Work hard to keep Kenobi alive through this objective, you'll need him for the next one.

Fight General Grievous
Welcome to the world of Hero Battles in Battlefront! As this is your first fight against another hero, detailed instructions are given. The first and most important rule in hero battles is: Know where your target is at all times. Because Grievous' attacks are so much more powerful than those of an ordinary unit, you have less room for error. When in doubt, use various aspects of your characters to your advantage. The second rule: Know your target. Know your strengths and weaknesses, and know theirs. Use these facts to your advantage. In this case, you have two distinct advantages: You have a ranged attack, and you have the ability to "fly". Grievous must get close to you in order to hurt you; therefore, your safest method of attack is through your secondary attacks. Use your saberthrow to damage him when he is not blocking. When he is blocking, you have no choice but to attack him up close; so start from several meters back, and sprint towards him. When you get close, press "attack" 3 or 4 times, and your character will unleash a deadly stream of attacks at Grievous. As soon as you regain control of Kenobi, force-jump away. Grievous will retaliate, and his attacks are more powerful than yours. Continue this until he is defeated.

If Kenobi is killed, respawn as either a Jet Trooper or an Assault Trooper. Unload your EMP launcher or your rocket launcher (respectively) into Grievous until he is dead. Either unit is useful for the next objective.

Destroy the AA guns
The obvious way to get to the Anti-Aircraft guns is on the ground. But in case you haven't noticed, there are tons of enemy units on the ground, just waiting to kill someone wearing a white suit. So find the ramps near the west end of the hangar and go up one. Use your blaster pistol to clear out any enemies waiting there, and continue on to the very end of the platform. Now here's the tricky part: you have to jump down onto the beam that is just off the end of the platform. Once you're there, start firing at the AA guns. (Obviously use your most powerful gun.) When they're both destroyed, don't walk forward and fall off the beam to the floor if you can help it - the enemy units are still there.

Destroy the Power Generator
There is one effective way to do this. Whichever unit you have (it doesn't matter), get in a tank, either your IFT-X or an empty AAT, and set your sights on the power generator. Ignore everything else and unload all your guns into the generator. You shouldn't have any problems at all with this. Destroy it and go on to the next level to kill those pesky Jedi!