If you have no plans to see Star Wars: Episode III, or you've seen it and want a recap, I can't recommend Rod Hilton's Revenge of the Sith: The Abridged Script highly enough.
If you haven't seen it, but you're planning on it, there are some spoilers in there. I can't believe I used the word "spoilers."
They fly toward CHRISTOPHER LEE'S SHIP so they can rescue SUPREME CHANCELLOR IAN MCDIARMID.
Oh no, the hangar has shields up!
HAYDEN shoots something next to the shield and they
The thing that powers the shield is
on the outside of the ship?
Yeah, it's pretty stupid. It'd be
like a life support system being in
a box on someone's chest.