Any ideas please?

A young lady had 2 young RIR's off me weeks ago.  They were about 6 weeks old.  She is trying to get them in together, but its not working.  I was going to suggest beak bits, but it not pecking, but sounds like all claws and feathers flying.  Her existing 2 girls are Pekins.  this is what she said to me in her email.

"i would be very grateful for any advice you could give me about putting them in with my original hens i have tried and its not nice, they are happy to roost together at night but the minute its light all hell breaks loose. They are in a separate run next to the other girls in the day, but i really need them all together."

and this morning:

"Its my older girls trying to get rid of the newbies!they are pekins, and its all feathers flying fighting, she won't give in even when shes got them pinned down.
They are all just about the same size now as well.
 
I might try when its cooler shutting them all in the coup together for 36 hours?"

She also thinks one of the RIR's is a cockerel, but whether hat makes a difference I don't know!

Thanks Joy, I will pass that on to her.  Except if it is a cockerel, I don't think she can keep him!

I'll also ask her if perhaps they could all free range like yours do, rather than be in a run.

Thanks for the input bluecharlie!  I have mentioned this to the young lady concerned, but I haven't heard back from her yet.  Hopefully she is trying it out!