Finally the breach was closed, and, encouraged by their progress, the fighters redoubled their efforts. By midnight the long row of flames had been turned into a mass of smoking embers. But the fire, though conquered, was not wholly dead. Squads of men were left to prevent another outbreak, and the others scattered to their homes to snatch a few hours' rest until called to relieve those on watch, for prairie fires are treacherous and may smoulder for several days, only to break out with renewed energy. They must be entirely extinguished, or watched closely until they die out. Recently another fire occurred, its history conclusively demonstrating the great value of the Forest Service. In Long Pine National Forest a sawmill has been permitted to be operated by the Government, under the control of the foresters. The supervisor of Long Pine Forest is one Charles Ballenger, who has his head-quarters at Camp Crook, South Dakota, some distance away. Camp Crook is connected with the mill town by a telephone line, and one day Ballenger received a message that a fire had started in the vicinity of the mill. He hurried to the place on horseback as soon as possible, reaching there the same day the fire started; but it spread so rapidly that a large area was ablaze by the time he got to the spot, although the mill-hands and people in the town had fought it as best they could. They began fighting the fire when it was only a spot about twenty feet square, but the earth was covered with so much dry wood and other inflammable material that the flames were carried through the forest at a great speed, driven by the high wind. [Illustration: A FOREST IN EMBRYO--MILLIONS OF YOUNG TREES ARE RAISED ANNUALLY FROM SEED TO BE PLANTED OUT FOR THE BENEFIT OF FUTURE GENERATIONS. _From a Photograph._] Ballenger realized that strenuous efforts must be made if the fire was to be checked, and that it would be useless to try to work against it in the direction which it was spreading. He accordingly organized the fire-fighters into squads, and directed them how to use earth and tree branches in working against the flames. Then an effort was made to change the course of the fire, all hands working along one side of the burning area. Thus its course was gradually changed towards what are called the Bad Lands, which are destitute of trees, and where the fire would not have enough material to keep it alive. This plan proved successful, although it was necessary to keep up the fight for forty-eight hours before the danger-point was passed. During this time, however, the flames had actually covered nearly ten thousand acres, eating into the forest at the rate of over two hundred acres an hour. No one thought of changing the course of the fire until Ballenger's arrival. His skill and experience, however, showed him that it was the only method which could be taken, on account of the extent of the forest and its extreme dryness.