I'm not sure how big the field is, but my best advice would be if you can't avoid it, definitely pick up some rolls of that nylon plastic "tape". We have it in orange and pink, it's super cheap, and I have a piece tied on in between every single fence post. It's probably not neccesary with our girls because they know the fence, but I did it when I brought my 2 year old home. A hyper active youngster doesn't always pay the best attention and I've seen them hit non-visible fences so many times. Any type of wire fence and it's a good idea because it has almost zero visibility to a galloping horse.
It will definitely give you a serious advantage in avoiding fence related injuries, especially in youngsters.