My sister, who is not a chicken person, got attacked (and not harmed in any way) by my bantam flocks now ex rooster.
This tiny dude made a grown woman scream like a banshee!
View attachment 1621614 After I stopped laughing I went to where he was and yanked him up and put him in the Batchelor coop with his 'brothers' where he has been ever since. He's still a little aggressive to me sometimes, only when I point a finger at him his hackles raise. He will never be the flock rooster again and I don't deal with him very often, but he still gets put in his place every time he comes at me, which isn't very often now.
With a constant 'I'm your boss' attitude, like I posted earlier, you should get good results.