Horses Gave me Quite a Scare today

We were driving home school and from the Road you can see our Huge hill in our backyard, I saw a horse or object standing on the hill and Im like Oh I didnt know we had something like that there and then we drove a little further up and I could see Montana ( Black& White Its hard to miss haha), And omg All 3 of my horses were in our Swamp /Grassy field and loose, We flew back and I started to sprint out there and the boys come flying up the hill and run right past me and a little ways down and then I had a peice paper in my pocket and started to crinkle it and they came runnign over to me and I succesfull walked all 3 into the Pasture, Anways Im kinda worried about them and what they might have Eaten, when I feed them about 2 hours ago Montana was eating very slow and Pg didnt touch any of his food and was very tired looking. Do you think I should be worried?