The Littlest Horse Thieves is a Walt Disney Production. Set in early 20th-century England, the film concerns three Yorkshire children who take pity on the ponies that are used as beasts of burden in the coal mines. The kids "liberate" the ponies with the help of a sympathetic groom. This action arouses so much public sympathy that the miners threaten to strike if the ponies are returned to their living deaths in the pits. A plot-solving last minute rescue segues into a joyous celebration, stage-managed by twinkly old Lord Harrogate (played by the indispensable Alastair Sim).
by Hal Erickson synopsis