It was a task of considerable difficulty to locate "E--". In the intense darkness--for not the faintest glimpse of a light could be shown--her position was completely invisible; and it was not until he was within twenty yards of the submarine that Dick detected the periscope and arched girder showing faintly against the subdued glare of the distant search-lights. "All right?" enquired Huxtable anxiously. "Yes, sir," replied Crosthwaite in a whisper. At a sign from the Lieutenant-Commander the rest of the landing-party took their places in the caique. Two of the seamen manned the long, weighted oars, each of which worked on a single thole-pin; then in utter silence the two boats headed towards the shore. Every man carried a rifle and bayonet and sixty rounds of ammunition. The safety catches of the rifles were set, to guard against an accidental discharge of any of the weapons; while orders had been given not to fix bayonets, lest the steel, shining dully in the faint starlight, should betray the presence of the British seamen to the Turkish sentries. Unchallenged, the boats rubbed alongside the pier. Dick stealthily ascended the perpendicular ladder till his head showed above the planking of the gangway. He could hear the muffled tread of the sentry pacing his beat in front of the tower. He could not hope to escape detection much longer; but provided a couple of men were at his back, he felt certain that they would be sufficient to commence the attack until the rest of the boarding-party could fall in and double for their objective. One by one the seamen ascended, until only one man was left in each boat to act as boat-keeper. Crouching and holding their rifles at the trail, the bluejackets followed Crosthwaite and the midshipman. Half-way along the pier they crept; then came the strident hail of the Ottoman sentry. Without a pause Dick advanced. The challenge was repeated, then a bullet whizzed high above the heads of the landing-party. "Double!" shouted the Sub. The planks trembled under the rush of many feet as the men raced down the pier. The sentry was running for dear life, yelling at the top of his voice, to the accompaniment of a rousing British cheer which was quickly taken up by the prisoners within the tower. Releasing the safety catches of their rifles, all but two of the submarine's men threw themselves on the ground in anticipation of an attack from the troops in the barracks. The two, headed by Farnworth, made their way to the door of the tower. "Stand clear, there!" said the midshipman in a loud voice, as a warning to any of the prisoners who might be on the other side of the door; then holding the muzzle of his revolver a few inches from the lock, he fired twice in quick succession.