For those who are good with the game, I really need help in star wars Battlefront II in the mission Knightfall. IVE SPENT 4 F**CKING HOURS ON IT AND I ALWAYS FAIL THE PART WHERE YOU HAVE TO DEFEND THE F*CKING BOOKCASES!

Is there any cheap strategies to defeat this part of the mission anyone? Im so desparate Ill even ask how to use cheats.
I AM VERY DESPARATE HELP!
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First off, TAKE OF THE CAPS.
The game is easy to beat, I hated that mission to. What you do is patrol, I only defended the bottom stair cases, I cant remember how many you have to have left, but just stick with the # forget about the rest, I recommend being a commander with that machine gun, its very easy to kill the Jedi with it.