When each assault ceased the weary soldiers threw themselves down behind the earthen embankment, and obtained such sleep as they could before the Spaniards mustered for fresh attack. When, after eighteen days' terrible fighting, the Duke of Parma saw that even his best troops were unable to break through the wall of steel, he desisted from the assault and began the slower process of mining. The garrison from their look-out beheld the soldiers crossing the bridge with picks and shovels, and prepared to meet them in this new style of warfare. Captain Uvedale was appointed to command the men told off for this duty, and galleries were run from several of the cellars to meet those of the enemy. As every man was employed either on the rampart or in mining, many of the pages were told off to act as watchers in the cellars, and to listen for the faint sounds that told of the approach of the enemy's miners. As the young Vickars were in attendance on the officers, they were exempted from this work; but they frequently went down into the cellars, both to watch the process of mining by their own men and to listen to the faint sounds made by the enemy's workmen. One day they were sitting on two wine-kegs, watching four soldiers at work at the end of a short gallery that had been driven towards the Spaniards. Suddenly there was an explosion, the miners were blown backwards, the end of the gallery disappeared, and a crowd of Walloon soldiers almost immediately afterwards rushed in. The boys sprang to their feet and were about to fly, when an idea occurred to Geoffrey. He seized a torch, and, standing by the side of a barrel placed on end by a large tier, shouted in Dutch, "Another step forward and I fire the magazine!" The men in front paused. Through the fumes of smoke they saw dimly the pile of barrels and a figure standing with a lighted torch close to one of them. A panic seized them, and believing they had made their way into a powder-magazine, and that in another instant there would be a terrible explosion, they turned with shouts of "A magazine! a magazine! Fly, or we are all dead men!" "Run, Lionel, and get help," Geoffrey said, and in two or three minutes a number of soldiers ran down into the cellar. The Walloons were not long before they recovered from their panic. Their officers knew that the wine-cellars of the city were in front of them, and reassured them as to the character of the barrels they had seen. They were, however, too late, and a furious conflict took place at the entrance into the cellar, but the enemy, able only to advance two or three abreast, failed to force their way in.