Chicks I showed in pen a couple days back have been in a battle royal all day. A couple would have been lost if they did not get wet and suffer a little hypothermia. I tried several things to stop the fighting with no good results. Then I moved whole pen into breeding pen with a cock (their dad) and hens. He started walking perimeter giving them threats everytime they started talking smack. After 15 minutes they settled down to eat and tend their feathers.