The bully I had would stand in the pop door and not let the others go into the coop to eat so I put a feeder and waterer in their run. I put a second pop door on the side of the coop and then she couldn't guard both pop doors. She wasn't aggressive until I introduced the pullets. They had a smaller run at the time and I opened their gate so they could enjoy the large pen. Originally the pullets were in an adjacent coop so they were always next to each other but when I let them mingle "Blue" was on them. I had a hose next to the coop with a fire nozzle. When I would catch her beating up a pullet I would put the hose on her and did catch her by surprise but she never gave it up. Another bird "Violet" joined her but eventually Violet gave up, but not Blue so Blue went to an auction. This was many years ago.