If it's not too boogered up yet you might wanna use a six point impact socket on it with your ratchet or breaker bar. Oh, be sure to use at least 1/2 in dr. and if it's that stuck maybe 3/4 dr will be better. It should pop loose with a bump of the starter and maybe some heat as well. Good luck with that!
![Beer Chug\'n :beerchug:](https://board.marlincrawler.com/Smileys/marlin/beerchug.gif)