you should use gaurd dogs and if they are your neighbours tell them about the situation but if they are stray cats call the animal control or catch them and drawn them
make sure they have space to hide
i think
1 you should keep them in the main coop from after noon to evening and let them roost in it(IF THEY WANT)
2 introduce them slowly and in a big place with some places to hide so that they are not harmed (IN YOUR PRESENCE)
3 if possible introduce them...
i have a aseel hen with a comb like a single comb but no zigzag pointy things and folded like a tissue paper
you can see pics in my profile the brown aseel