There was a curious small building called the Grange aux Dimes, divided into two parts, one subterranean, the other on the level of the soil. Two staircases, one inside, the other outside, led to a hall on the first floor. This was divided by two ranges of pillars, with ornate capitals of foliage. The door to the subterranean passage was unfastened and we ventured down into the darkness and must for a short distance. I am convinced that we might have had some adventures below had we explored the tunnel. Near this was "Le Puits," supposed to be the entrance to other vast vaults, a subterranean town extending beneath the hill for miles, and formerly used for many purposes in the Middle Ages. These vaults were to be found in many of the towns hereabouts, and during the occupancy of the country by the Germans since the invasion of 1914, the soldiers have used them to store away ammunition and supplies. Over these small towns for three years now have raged battles the like of which for fierceness and bloody loss the world has never seen. The small town of Marcoing, about five miles from Cambrai, had one of these wonderful caverns of refuge dating from the Middle Ages, and there were others at Villers-Guizlain and at Honnecourt, where there were the ruins of a Roman town, and an immense church with a porch of the eleventh century. This was said to have been a famous place of pilgrimage in the twelfth century. Tradition has it that in that century three brothers of the family of Courcy le Marchais were taken prisoners during the crusades. In the power of the Sultan they languished, until at length he bethought him to send his young daughter to their dungeon, where they lay in chains, thinking that she might by the power of her beauty and eloquence bring them to the faith of the Mussulmans. But strange to relate, she it was who succumbed to the arguments of the three fair-haired brothers, and finally promised to become a Christian provided that they show her an image of the Holy Virgin of whom they had so eloquently told her. Now the three brothers had no image of the Virgin, everything having been taken from them when they were cast into the dungeon. But all at once, says the Chronicle, the image of the Virgin bathed in golden Celestial light appeared miraculously before them in a niche on the wall, so the Sultan's daughter, thus convinced, not only set the three fair-haired brothers free, but accompanied them, bearing in her bosom the sacred image, which henceforth was enshrined here on the altar and venerated.