Just don't delude yourself that a rooster can really battle a large predator and live. Most of the time, he'll fight to the death to allow his girls to get away if they can because that is in his makeup, it's what he does without a thought to his own safety. A rooster spends most of his time just watching while the hens stuff their faces and he is your first line of defense, but be prepared to lose him in a fight with a predator. I've heard of rare cases of roosters coming out on top in battles with foxes and coons, but those are the exceptions.