We have eight cats around and in the house. There is one grey cat who just keeps trying and trying to nail a hen. They can fly faster than he can run and will fly up on a fence or tree if he bothers them but he just keeps on believing he can get one. After a while, I was fed up with him trying and got the cat one evening and threw him in the hen house for the night. In the morning there was a supersonic grey streak that blew out of the henhouse when I opened it up and some indignant hens vocalizing how peeved they were that I would insult them like that.
However.......
The cat has not gone near any of the hens since that day......I can't help believe that they pecked him into a corner all night, he was covered in poop....which must have tasted quite good when he groomed himself....