Last night I put both sets of chickens (3 9 week pullets with 3 grown laying hens) in the run and closed the doors. It’s their first time being together with no escape. I felt I was cruel to do this but I also read it has to happen. No one was set out to kill the little ones, I don’t think. There was no blood. But there was traumatizing and chasing and probably some pecking. We go on a trip in 3 weeks. I kept them together maybe 30 min while watching. A couple of times the littles escaped to the coop upstairs and the bigs did not follow. The last time (meaning they all came down from the coop again) all but one escaped to the coop and she could not figure how to get up there. In the end she was standing in a corner, facing the corner and would not move. We then separated and put the littles in their small coop for the night.
Did I do the right thing? The wrong thing? It was a pleasant night and I put them together around 7:15 and sat and watched. It was hard for me to watch. IF I did the right thing, should I keep doing the same each day for a short period of time? Should I not?
These chickens have been able to see each other for 5 weeks, in separate coops and also in playpens with the older ones coming near. They’ve been in the yard together at times for about a week now, always supervised. They already know each other. But not in this close quarters.
I feel trying to prepare these chicks to be together and in time for my upcoming trip has become a full time job!
I did have places for them to hide but not completely away. Today I plan to put a dog crate with no floor in the coop and tilt it up some so they can go under and have a safer place to escape.
I just need some reassurance (if appropriate) or to be told if I need to change the approach. I love these new babies and don’t want to do it wrong.
To see my coop I pasted pics here. I realize now that it is narrow but I have to make do with what I have. https://www.backyardchickens.com/threads/integrating-chicks-before-12-weeks.1538361/
Did I do the right thing? The wrong thing? It was a pleasant night and I put them together around 7:15 and sat and watched. It was hard for me to watch. IF I did the right thing, should I keep doing the same each day for a short period of time? Should I not?
These chickens have been able to see each other for 5 weeks, in separate coops and also in playpens with the older ones coming near. They’ve been in the yard together at times for about a week now, always supervised. They already know each other. But not in this close quarters.
I feel trying to prepare these chicks to be together and in time for my upcoming trip has become a full time job!

I did have places for them to hide but not completely away. Today I plan to put a dog crate with no floor in the coop and tilt it up some so they can go under and have a safer place to escape.
I just need some reassurance (if appropriate) or to be told if I need to change the approach. I love these new babies and don’t want to do it wrong.
To see my coop I pasted pics here. I realize now that it is narrow but I have to make do with what I have. https://www.backyardchickens.com/threads/integrating-chicks-before-12-weeks.1538361/