As I ascended the upper track two bandages men were coming down on led mules. It was mid-August, and they were suffering from frostbite. Across the great gap between the summits a minute traveller with some provisions was going up by wire to some post upon the crest. For everywhere upon the icy pinnacles are observation posts directing the fire of the big guns on the slopes below, or machine-gun stations, or little garrisons that sit and wait through the bleak days. Often they have no link with the world below but a precipitous climb or a “teleferic” wire. Snow and frost may cut them off absolutely for weeks from the rest of mankind. The sick and wounded must begin their journey down to help and comfort in a giddy basket that swings down to the head of the mule track below. Originally all these crests were in Austrian hands; they were stormed by the Alpini under almost incredible conditions. For fifteen days, for example, they fought their way up these screes on the flanks of Tofana No. 2 to the ultimate crags, making perhaps a hundred metres of ascent each day, hiding under rocks and in holes in the daylight and receiving fresh provisions and ammunition and advancing by night. They were subjected to rifle fire, machine-gun fire and bombs of a peculiar sort, big iron balls of the size of a football filled with explosive that were just flung down the steep. They dodged flares and star shells. At one place they went up a chimney that would be far beyond the climbing powers of any but a very active man. It must have been like storming the skies. The dead and wounded rolled away often into inaccessible ravines. Stray skeletons, rags of uniform, fragments of weapons, will add to the climbing interest of these gaunt masses for many years to come. In this manner it was that Tofana No. 2 was taken. Now the Italians are organising this prize, and I saw winding up far above me on the steep grey slope a multitudinous string of little things that looked like black ants, each carrying a small bright yellow egg. They were mules bringing back balks of timber.... But one position held out invincibly; this was the Castelletto, a great natural fortress of rock standing out at an angle of the mountain in such a position that it commanded the Italian communications (the Dolomite road) in the valley below, and rendered all their positions uncomfortable and insecure. This obnoxious post was practically inaccessible either from above or below, and it barred the Italians even from looking into the Val Travenanzes which it defended. It was, in fact, an impregnable position, and against it was pitted the invincible 5th Group of the Alpini. It was the old problem of the irresistible force in conflict with the immovable object. And the outcome has been the biggest military mine in all history.