Further away to the east could be seen a great number of sailing-boats and steamers. Just at seven o'clock a great puff of white smoke broke out from the black side of the _Invincible_, which was carrying the admiral's flag, and even before the sound reached the ears of the little party on the hill similar bursts of smoke spurted out from the other vessels. Then came the deep roar of heavy artillery, mingled with the rushing sound of their huge missiles through the air. Almost immediately an answering fire broke out from all the batteries fringing the sea. In a minute or two the hulls and lower masts of the men-of-war were entirely hidden in clouds of white smoke. The very ground seemed to shake with the thunder of heavy guns, mingled with which came the sharper sound of some of the smaller artillery in the forts and the long rattle of the machine-guns in the tops of the men-of-war. So terrible was the din that the Egyptians ceased their chatter and sat in awed silence. The shell from the Egyptian guns could be seen bursting over the vessels, while jets of water spurting out far to seaward in all directions marked the course of the round shot. "It is downright awful, isn't it?" Arthur Hill said in a hushed voice. "I've often thought I should like to see a sea-fight, but I never thought it would be as terrible as this." "No more did I, Arthur," Jack agreed. "I feel just as I have done when I have been out in the bawley and a big thunder-storm has burst overhead. If it feels like this here, what must it be on board a ship?" "I don't believe it is half so bad there," Jim Tucker said. "They are all hard at work there at those big guns, and haven't got much time to think about it. I wish we could see what harm the shot are doing them. They have got some tremendous guns in some of the forts--pretty well as big as they are on board." For an hour there was no change whatever in the state of things, then the little gun-boats were seen to be in motion. Steaming away to the west, they engaged the Marabout Fort, which had hitherto taken its part in the fray without any return on the part of the assailants. "I believe the fire of the forts is slackening," Jack said. "Look at that fort at the entrance to the harbour, its outline is all ragged and uneven. I wish the wind would freshen up a bit, to let us see a little more of what is going on." Another hour and it was evident to them all that the fire of the forts was nothing like as heavy as it had been at first, while the guns of the fleet continued to thunder as steadily as when they first commenced. At twelve o'clock several of the forts had ceased to fire altogether. At one, the gun-boats having silenced the Marabout Fort, joined the three men-of-war in the bombardment of the Mex Batteries, and the _Temeraire_, having silenced the fort at the entrance of the Boghaz Channel, joined in the attack on the Ras-el-tin and Pharos Forts.