Not sure where you live? But if you don't cut their wings, they won't stay inside the fence unless you put a roof on it. They just aren't build for longer flights.
@newjaninev2 I don't know annyone in my region that doesn't cut the wings of their chickens. It's either that, or building an actual coop. Else they'll just be all over the place, unless there is a rooster, then they'll just be where the rooster is.
