Quick run down of season 1?

Hello, I got a question answered about updates i missed, but could someone give me a run down of the story missions from season 1? Haven't played in a long while and I don't remember how it ended, but didn't we fight the general? The trailer has a lot of things I don't remeber seeing when I was doing part one while Hailey was still new. If I could get a summary that would be great, or is the stuff with H.O.U.N.D the next part of all that?