Never, so far as we could tell, was there any congestion, any hitch, any suggestion of confusion. Frequently there would come from a sideway a group of officers on horseback, or a whole string of commandeered touring cars bearing monocled, haughty staff officers in the tonneaus, with guards riding beside the chauffeurs and small slick trunks strapped on behind. A whistle would sound shrilly then; and magically a gap would appear in the formation. Into this gap the horsemen or the imperious automobiles would slip, and away the column would go again without having been disturbed or impeded noticeably. No stage manager ever handled his supers better; and here, be it remembered, there were uncountable thousands of supers, and for a stage the twisting, medieval convolutions of a strange city. Now for a space of minutes it would be infantry that passed, at the swinging lunge of German foot soldiers on a forced march. Now it would be cavalry, with accouterments jingling and horses scrouging in the close-packed ranks; else a battery of the viperish looking little rapid-fire guns, or a battery of heavier cannon, with cloth fittings over their ugly snouts, like muzzled dogs whose bark is bad and whose bite is worse. Then, always in due order, would succeed the field telegraph corps; the field post-office corps; the Red Cross corps; the brass band of, say, forty pieces; and all the rest of it, to the extent of a thousand and one circus parades rolled together. There were boats for making pontoon bridges, mounted side by side on wagons, with the dried mud of the River Meuse still on their flat bottoms; there were baggage trains miles in length, wherein the supply of regular army wagons was eked out with nondescript vehicles--even family carriages and delivery vans gathered up hastily, as the signs on their sides betrayed, from the tradespeople of a dozen Northern German cities and towns, and now bearing chalk marks on them to show in what division they belonged. And inevitably at the tail of each regiment came its cook wagons, with fires kindled and food cooking for supper in the big portable ranges, so that when these passed the air would be charged with that pungent reek of burning wood which makes an American think of a fire engine on its way to answer an alarm. Once, as a cook perched on a step at the back of his wagon bent forward to stir the stew with a spoon almost big enough for a spade, I saw under his hiked-up coat-tails that at the back of his gray trousers there were four suspender buttons in a row instead of two. The purpose of this was plain: when his suspenders chafed him he might, by shifting the straps to different buttons, shift the strain on his shoulders. All German soldiers' trousers have this extra garnishment of buttons aft. Somebody thought of that. Somebody thought of everything.