If you're having this experience now, please be calm! This is a natural side-effect of keeping more than one male chicken. Don't try to separate the roosters, and don't intervene. You don't have to watch if you don't want to, but they will have to fight it out for themselves, and will likely be finished after a few days.
It's critically important to leave your roosters alone during this process, because the more you distract them, the longer and bloodier the battle will be. I once went as far as to lock one of my cocks in a cage, but when I let him out, the fight continued for another week.
Just remember, the war will be over soon, and your roosters will recover and begin looking handsome again. My roosters fought in their box until late last night, but when I let them out this morning, a new pecking order had been established with very little bloodshed.