a retired war man in a mental hospital, attacks the nurse while he hallucinates he still in the battlefield.

yeaph thanks , it is for a short film!!!

Yeah, this sounds like an interesting premise(for a short or something) but doesn't sound like a movie without additional information.

We have had a similar type of logline here on the site before. This is really more the description of a single scene rather than the promise of a full story.

Is this for a short or feature film?

Have a read of the tips on this site, it will help you in shaping a sentence that does a better job of selling your story. Good luck!