Horses ridden by the 11th United States Cavalry cannot hold their footing in deep sand dunes.
Item title reads - Soldiers of the saddle. 11th U.S. Cavalry give spectacular display of horsemanship over ridges and thigh deep sand dunes of California. America, USA (U.S.A).
L/S as the Cavalry and their horses ride over the dunes and rough terrain, various shots as the horses gallop up and down the ridges. M/S as the horses run down the sand dunes, they wade through and slip some of the way. M/S as they make their way down the hill, some horses fall and slide down, we see this from various angles as more horses tumble over in the sand.