I ended up giving one of my barred rocks to a new home, larger flock, rooster, etc. She was a bully as was the other barred rock who only fought with the other barred. I know confusing. The barred rock that was the first victim started attacking a partridge plymouth, badly, after the second wound that she inflicted, after a week of isolation, I decided she was a problem and so she went to a new home. My three remaining have been harmonious for a couple of months now, hoping it lasts. I don't know what their problems were but I am not reluctant to add anyone else to the flock. I don't want to deal with that again and I don't have very good resources to isolate for long periods of time. So for now, just 3 hens.