It would, perhaps, be well to substitute this for the usual method of evolving them from old stage material or newspaper clippings.
There is in the Metropolitan Museum a noble modern group, the Mares of Diomedes, by the aforementioned Gutzon Borglum.

It is full of material for the meditations of a man who wants to make a film of a stampede.

The idea is that Hercules, riding his steed bareback, guides it in a circle.
He is fascinating the horses he has been told to capture.

They are held by the mesmerism of the circular path and follow him round and round till they finally fall from exhaustion.

Thus the Indians of the West capture wild ponies, and Borglum, a far western man, imputes the method to Hercules.