Mules transport supplies through Chihuahuan Desert in Mexico during US expedition against Pancho Villa

Title card: "Somewhere in Mexico, The difficulties of transport over the barren wastes of the Chihuahua desert are overcome by the use of large numbers of mules: / soldiers driving wagons pulled by teams of mules through desert / row of parked wagons, soldier leading mules along in foreground / soldiers letting mules drink water from troughs / two mules rolling around on ground taking dust baths as soldier watches / Note: exact month/day not known; film has nitrate deterioration