For labor we had all we could pick up abroad: able-bodied German prisoners, middle-aged and invalided French territorials, Senegambians, Turcos, Belgians, Spaniards, Chinese, Annamites. From home we had, aside from expert labor, chiefly the colored men, who had no rivals in "rustling" cargo. At the docks their giant strength and their good-natured team-play were supreme; but they were in evidence all the way forward to the shelled roads which they were repairing back of the front where their kinsmen had their place in line. The feeling between the regulars and reserves, which I shall describe in general terms elsewhere, was bound to be most acute in the S. O. S. Suffice it to say for the present that it was a gospel with the regulars that they should hold all the high commands in the S. O. S. as well as at the front. It was granted that the regulars must be absolute in the zone of advance, and all reserves their pupils or "plebes"; but how was the manager of a great railroad, of a bakery, of a contracting firm, a chemist, a civil engineer who had built tunnels and bridges, or a business organizer, to feel that a regular officer was his superior in his own line? The answer of the regular was that only he understood how to coördinate all policy for military end,--the old, old answer of the inner temple of mystery, from the days of the Egyptian priests to the present. The regulars said, too: "How can we tell who is the real expert? These big men from civil life are jealous of one another. To appoint one over the heads of others would bring friction. We know war. Supply is a part of war. And we shall keep matters in our own hands----" and promotions, too, as the reserves might whisper.