At three o'clock there was a tremendous explosion in the Pharos Fort, and now only an occasional gun answered the fire of the assailants. This soon ceased, and at four some signal flags were seen to run up to the masthead of the _Invincible_, and instantly the fire from the British ships ceased, and a dead silence succeeded the din of battle that had continued almost unbroken for nine hours. CHAPTER XII. FREE. FOR two or three hours before the cessation of bombardment flames had been bursting out from several buildings in the neighbourhood of the palace of Ras-el-tin. These being in the line of fire, had doubtless been struck by shell from the ships passing over the forts in front. When the fire ceased the Egyptians rose and motioned the boys to return to their prison. "Well, you see, my friend," Jack said to the man who spoke English, "you have not sunk the English vessels in a few minutes, as you talked about. Not even one of the little gun-boats; and as far as I can see from here you have not even damaged them." The man made no reply. To him and his comrades the escape of the British ships was a mystery. That they were made of iron they understood, but had no idea of the enormous thickness of their sides; and could not even imagine that ships could be built sufficiently strong to keep out the missiles discharged by the immense cannons in the forts. That not even a mast should have been knocked away seemed to them almost miraculous. In point of fact the ships had been struck but once or twice with the shells from these massive cannon. The Egyptian gunners were unaccustomed to the use of the huge pieces, and had consequently aimed too high, and the shell had passed either between the masts or far overhead. Upon the other hand the smaller guns had been worked with accuracy, but their missiles had dropped harmless from the iron plates of the ships. The fire of the men-of-war had, in the first place, been directed mainly against these great cannon. The machine-guns in the top had created terrible havoc among the men who were carrying on the laborious and to them difficult operation of loading them, while the huge shell from the great guns had carried wholesale destruction among them. Thus the powerful guns upon which the Egyptians had relied to beat off any attack from the sea, had been fired but seldom, and one by one had been dismounted or rendered unserviceable by the fire from the ships. The gallantry with which the Egyptian gunners stuck to their work was the object of surprise and admiration to the British sailors. It seemed scarce possible that men could work under so tremendous a fire as that to which they were exposed. The forts were literally torn to pieces, and at the end of the day were little better than heaps of ruins scattered thickly with the corpses of the Egyptian artillerymen. "Well, what do you suppose they will be up to next, Jim?" Arthur Hill asked when the door had again closed upon them.