Another revolution in army methods, the result of the imperious necessity for the highest efficiency possible to obtain, whether from soldier or officer, individual or army, was the sweeping away of the old system of promotion by seniority. All officers below the rank of Brigadier-General, under these new regulations, had to undergo the passing of judgment upon them every three months by their immediate superiors. They were rated according to their physical and personal qualities, capacity for leadership, intelligence, and value to the service, and promotion depended upon how well they passed these tests. CHAPTER II HOUSING THE SOLDIERS AND THEIR SUPPLIES While the machinery was being devised and set in motion for forming a great army by means of the selective draft and officers were being schooled for its training, immense camps had to be provided in which hundreds of thousands of men could be trained, warehouses had to be built in which to gather and store the enormous amounts of supplies necessary for their maintenance and equipment, huge plants had to be constructed for the making of certain kinds of ordnance, and included in the vast scheme of construction work, all of it necessary almost at once, were also flying fields, embarkation depots, port and terminal facilities. The work of building the cantonments was, alone, a very great engineering achievement. It called for an expenditure within three months of $150,000,000, more than three times that of the largest year’s work on the Panama Canal, and it demanded the construction of nearly a score of goodly sized cities, to be ready for occupancy by the following September. For this huge job, when war was declared, there was one colonel with four assistants and a few draughtsmen, clerks and stenographers. Around that lone colonel there was built up, almost over night, by telegraph and telephone, the organization of the Government’s Construction Division, that carried through successfully the whole vast program. For the building of the cantonments, engineers, town planners and civilians having expert knowledge came to its assistance, investigating possible sites and studying their water supply, transportation facilities and availability of construction materials. Contracts were let for sixteen National Army cantonments and as many National Guard camps. These were all signed between the fifteenth and twenty-seventh of June and in three months some of them were in use, while in six months all the work had been finished, plus many additions and betterments.