good advice above. You will need to get creative for a bit to prevent any one of them from getting too badly hen-pecked. They are flock animals and instinctively will protect from an intruder. The new ones are intruders. But, they will eventually make peace, but it can be a lot of turmoil...
Pecking order has to play out.
normally, new chickens are introduced to the existing flock over the course of several days or a couple of weeks. You have to physically separate the new from the old, but be able to interactwith each other. So, a fence or a large dog cage, etc.
If it is...