When a good man goes to war...

Castiel was fighting against Raphael's followers in heaven, but he got wounded very bad. His grace was ripped out, so he uses his last ounce of power to go to the people he knew he'd be safest with: Sam and Dean.
Can they help the injured angel before it's too late?
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This is my first Supernatural fanfic, and I'm a sucker for sick or hurt characters in stories. There is swearing, and possible destiel.
Enjoy!!!!