We had the same problem when we first got chickens. Sometimes two attacks a day, but I don’t remember how many we lost in total. There were Red tailed hawks and Cooper, almost like they had shift changes. It was stressful for everyone. We tried keeping them inside for a few weeks and thought the hawks moved on, but the attacks started again days after they were let out. We bought tons of shiny owls, discs with bells and ribbon tape, and just littered the yard with them- it looked like a child’s birthday party in the backyard, but that didn’t deter them either. Our last resort was trying what we read about ‘air-dancers’ and how some farmers use them. We put a 6ft dancer near the coop and just waited. The chickens free-range all around it and aren’t at all bothered, but the hawks circle, fly high over sometimes, but never land. It has been two years now with zero attacks. I recommend trying one out if all else fails!