This is such a timely post. My girls have been happily free ranging for about two months with no issues until a couple of days ago. I do think the leaf-less trees is an issue with hawks...
Anyhow, my husband pulls into the drive and yells for me to come out. I come out, and he tells me that he saw a hawk flying out of the yard and all the chickens making a ruckus and taking cover in the woods. I saw a big fluff of downy feathers on the ground, and my girls were in deep deep brush, hiding. And that hawk? Hanging out. Stalking. Moving from limb to limb, tree to tree, completely unafraid of my attempts to shoo it. It just was waiting.

This went on for a good long while, more time than I have on my hands.

The next day, I heard the crows chasing a hawk off in the morning, and around 3 PM, I had not one but three circling really low where the girls normally are. So, needless to say, my "I only have a coop and free range during the day plan" is OVER. :/ I hate it for them, but, I don't want to just feed these hawks.

I am currently building one of those 10x4x6 doggie pens and will spend the next two days covering it with wire. :/
As for the girls...they are ok.

Thank goodness! I cannot tell how was de-feathered. They all look great. ????? I feel fortunate that my husband came home at that time!
Anyhow, you cannot feel bad, anyone. There is such a balance between giving them a happy life of free ranging freedom, and protecting that life. I plan to free range, but not as freely as before. I think this is a realization many many chicken owners eventually learn.

<3