Four RIR's about one year old. Suddenly one (Ruby) is attacking all of the others

[Gecko Chick]

I've got Ruby separated from the other three right now. She's been maybe #2 or so in the pecking order and everything was fine yesterday, which was July 4th. There was a bit of noise last night, but we're in a rural area and when I checked on the gurgles during the night, they seemed fine. Ruby looked a bit hysterical when she came up to the side of the run to see me. Does it have to do with molting? Is it driving her crazy? She's not apparently molting but 2 of the others are. Any ideas? I don't want her to have to spend the night in the run, by herself, unless it's absolutely necessary.
I just returned from sitting and watching them in their adjoining tractor and run. I decided to put them together again and to watch. Ruby jumped on Delores' back and looked as if she was trying to breed. Or maybe it was like a bull-ride for her. Then she got knocked off and attacked Blondie, who was just minding her own business and came away with a beakfull of feathers from Blondie's back.
I separated them again.
Thanks for any ideas.

THEN I was given a suggestion and have followed it. Let them be and stop mothering them. They'll duke it out and hopefully there won't be serious injuries. If I separated them tonight, I'd have to continue separating them and I couldn't see us doing that. They're now together again and there are some blood-curdling squawks and I'm hoping that with the sunrise will be peace in the run. Amen.

 

[Den in Penn]

Well did you go out to find Ruby standing on a pile of bones or everyone alive with just a few feathers floating around? Sometimes you have to let them work out their order.