How do you destroy the Imperial Star Destroyer in Star Wars The Force Unleashed

it was hard for me to but you have to use the force until it fals down and when tie fighters come ignore until half health then destroy tie fighters and redo and again and again. :)
or you could enter the invincible password which is "cortosis" and ignore the TIE fighters completely (i havent acctually tried it out yet im on this site to find out what it was and i did)
what i did was hide behind a piece of scrap and made the ship point down