Is there a way to 'turn this situation to our advantage'? [=is there a way to exploit this situation?; is there a way to take advantage of this situation?]
The union should be 'at an advantage' [=should have an advantage] in the negotiations.
She used her position for personal 'advantage'. [=for personal gain; to help herself]
(..) I have some for you. Something festers in the heart of Middle-earth. Something that you have failed to see. But the Great Eye has seen it. Even now he presses his advantage. His attack will come soon. You're all going to die. But you know this, don't you, Gandalf? You cannot think that this Ranger (..)2003 The Lord of the Rings: The Return of the King