You will eventually loose a bird/birds when free ranging. It's a risk you take. I built nice large covered pens for my birds so they have a lot of room. I learned the hard way. I have heard no complaints and I have seen hawks around but apparently they know they can't get to the birds. You can...
Glad your flock is ok. You can't depend on a rooster to protect the flock. A hawk will get him too if it has the chance. Sorry to say but true, it's the risk you take when you free range. You will eventually loose birds no matter how many years you have had them and sooner or later especially...