Marguerite Henry

A meandering mule and an old prospector find gold and adventure in the Grand Canyon in this family programmer. (All Movie Guide)

In 1727, an Arab colt is born with the signs of the wheat ear and the white spot on his heel: evil and good. And thus begins the life of Sham. He is a gift to the King of France, through a series of adventures with his faithful stable boy, Agba, he becomes the Godolphin Arabian, the founder of one of the greatest thoroughbred racing lines of all time. (imdb)

Every year the Chincoteague fire department rounds up the wild ponies of Assateague Island and auctions off the colts and yearlings to thin out the herd. A young brother and sister have set their hearts set on owning one particular wild three-year old pony, The Phantom. Only they have to earn the money, the Phantom has to be captured in the roundup (which she never has), and then they have to outbid everyone else for her.

A teenage boy gets a job as a Pony Express rider in the Nebraska Territory not long before the Civil War breaks out.