Years ago I had a crabby hen instead of crating her I staked her in the coop. It was a rush job to solve an immediate problem but it worked very well. I tore a plastic bag into a strip, making a foot bracelet, tight enough she couldn't slip it off, loose enough not to cut off circulation. Then staked her with a string and a stick giving about foot long string. That created a small circle of space, short enough she could eat and drink, reached at the perimeter. When I came home from work she was fine and so were the other chickens she was persecuting. So I left her that way for a few days. I drive by someone that has a bunch of roosters staked out, (probably fighting chickens) and have seen them staked for years giving me the idea. Not an ideal thing to do to a chicken, but on the plus side using it on a bully, they stay in the coop, and get used to new additions without injuries to anyone. Nowadays, I have multiple coops and rearranging chickens also works for me. Most of my chickens have bonded with a like age chick group, so adding an outsider is a problem One thing I've noticed, a mature rooster seems to calm a coop. Recently I had to add a golden laced wyandotte pullet to a coop of 14 hens. What I did was switched out roosters putting in the older rooster with wyandotte. The wyandotte clung to the rooster for a day or two.
