Born in June 1883 to an aristocratic Scottish family, Dorothy Gibson-Craig was brought up with dogs and horses. In 1926 she married Maj. Gen. Geoffrey Brooke, recipient of the Distinguished Service Order in World War I and a writer on equine culture. She followed her new husband to Cairo, where she discovered thousands of malnourished and suffering former British war horses leading lives of backbreaking toil and misery.

Brought to the Middle East by British forces during the Great War, these ex-cavalry horses had been left behind at the war's end, abandoned like used equipment too...