This is my third year with my flock, and I have learned so much about predators. My first year, I started with 6 bantams and they free ranged my back yard freely. All I had was a chain link fence without any issues. Once they started laying and hatching chicks the first attack happened. A chicken hawk grabbed one of the chicks right in front me. So until I could upgrade my fence I would only let them out when I was home and kept and eye out. I didn't have any issues until the following year when 2 stray dogs found a way in through my fence in the front yard and found my chickens in the back and just chewed as many as they could catch a leave them there. Lost 10 that day in just seconds. So I did the electric fence and it worked. No more dogs and all seemed to be at peace again. Towards the end of the year I added a wooden fence to the backyard and had to take down the electric wire down for a bit. Then all of a sudden stray cats started showing up and were snatching my bantams because they looked like small birds. I built them a large run 20 feet by 60 feet using 6 feet tall welded fence with 2x4 inch rectangles. So that kept the cats out and eventually all was at peace again. Now these last 2 months I've had some losses due to opossums! They are able to squeeze through those 2x4 rectangles. So I'm about to re-install my electric fence again. Has anyone had success with this type of protection against opposums? Sorry for the long story.
Hens go broody when you don’t want them to… and won’t go broody when you do. 
dem doggies
JK.
you have put a lot of thought and effort to protecting your flock