We have problems in the fall/early winter with the young hawks. We yell at them. All chicks are kept inside. Or they have a mother and a rooster to help guard them. I usually lose a hen, as they can kill her but not take her away as she is too heavy.When the rooster is with her, that problem is decreased. (We remove the dead hen as we dont not want to reward the young hawk. He needs to learn to hunt in the woods.) Roosters watch the skies.
Make low lying platforms for the chicks to dive under. THey really need an adult to watch the skies and scream "hawk" and the babies will have time to dive for cover. ( In one such event, my hen was walking with me when the alarm was sounded. Every bird disappeared. I looked around for my hen. SHe was under the car!!! ROFL)
I advocate for keeping a rooster. My groups have several roosters, they watch the sky while the girls eat and mind the chicks. Something to think about as you go forward with chickens.
We are losing acres and acres of woods to houses here; less habitat for the hawks.