I would get some hardware cloth and skirt it around your pen. L sape it off your pen on to the ground. You want a good eighteen inches on the ground, if you want you can bury it a little under the dirt or just on top, I like to put a few heavy rocks on it at first then the grass will grow right thru it. I want to go down to the river and get some nice big flat river rock on the heavy side and dig them in a little around my Silkie pen and make like a sidewalk. For now I've been putting those big building blocks with the two holes in them ( cant think what there called right now) around mine till I get my river rocks. The good thing is the grounds so hard right now from no rain it's like a rock.
I was out with my peeps in the orchard yesterday and here come one of those darn hawks flying right towards us I stood up and flapped my arms hoping that would show him how big I was as I'm thinking about attacking him if he kept coming thank goodness he veered off and landed in a tree right by us staring at my chickens. I grabbed up Sassy that can't see good from all her fluff and shooed Rusty in the coop who really wanted to stay out, he looked at me like I was nuts maybe he thought he could take him. He did growl at him. Darn hawk ruined or time in the orchard.
I wish they would move on.