His four months old coup is extremely large. First introduced him to two new hens and straight away he stated attacking them ripping feathers out. To the point he had the huddled up in a corner wall. He’s only ever previously had one hen and a turkey gobbler with him. Never showed aggression toward them.Welcome!
Do you have youngsters, or older birds? How big is your coop and run, how many birds, and how old are they? Are you introducing them after being separated by wire fencing for a while? Any injuries?
More information will help here, and photos of your coop too.