Uncle Sam Watching The Mexican Border

A bit of film now in the public domain from the files of the US National Archives, about US military activities along and across the border with Mexico during the era of Pershing and Pancho Villa, circa 1916, and the conflicts in that nation that threatened to spread into the US. It's an interesting look at soldiering in the period just before the World Wars, especially the logistical aspects....transporting covered wagons on train cars, for example. Automobiles versus cavalry horses and pack mules....the advent of machine guns and use of airplanes and radio in conflict and warfare.