Integration is always a difficult time...and not just for the chickens. I dread integrations because of the unknowns involved...are they all going to get along? Are there going to be any injuries? Am I going to keep a close enough eye on them to prevent something bad from happening? If...
You need to separate them until you can integrate them properly. Here's a link on how you can do that:
https://www.backyardchickens.com/a/adding-to-your-flock
You will need to wait until all wounds are healed or nearly so. Either way, they need to be nearly invisible.
Good luck.