They were losing the battle badly and then Luke Skywalker found the exhaust port, an exhaust port which shouldn't have existed because the Empire shouldn't have made such a mistake, but it did.
لقد كانوا يخسرون المعركة ومن ثم وجد"لوك سكايوكر" منفذ العادم، لم يكن من المفترض تواجده،