But it was in the Gallipoli campaign that the conditions were most trying and most novel. The British submarines detailed for the attack in Turkish waters had to begin by navigating the Dardanelles against a very rapid current, setting strongly into a succession of bays. They had to pass searchlights, mines, torpedo-tubes, nets and guard-boats; and in the Sea of Marmora they were awaited by a swarm of cruisers, destroyers, and patrol-boats of all kinds. Yet, from the very first, they were successful in defeating all these. Boat after boat went up without a failure, and maintained herself for weeks at a time without a base, returning with an astonishing record of losses inflicted on the enemy. These records will be given more fully in a later chapter; but that of E. 14, Lieut.-Commander Courtney Boyle, may be quoted here as an example, because it is no exceptional instance but merely the earliest of a number, and set a standard which was well maintained by those who followed. The passage of the narrows was made through the Turkish mine-field, and its difficulty may be judged by the fact that E. 14, during the first 64 hours of the voyage, was diving for 44 hours and 50 minutes. After she began her patrol work, there was more than one day on which she was under fire the whole day, except when she dived from time to time. The difficulty of using her torpedoes was extreme; but she succeeded in hitting and sinking two transports, one of which was 1,500 yards distant and escorted by three destroyers. Finally when, after twenty-two days’ patrolling, she began her return voyage, she was shepherded by a Turkish gunboat, a torpedo-boat, and a tug, one each side of her and one astern, and all hoping to catch her in the net; but by deep and skilful diving she escaped them, and cleared the net and the mine-field at a speed of 7 knots. Her second patrol extended over twenty-three days. This time the tide was stronger, and the weather less favourable. The total number of steamers, grain dhows and provision ships, sunk on this patrol, amounted to no less than ten, and the return voyage was successfully accomplished, the boat tearing clean through an obstruction off Bokali Kalessi. The third patrol was again twenty-two days. An hour after starting, E. 14 had her foremost hydroplane fouled by an obstruction which jammed it for the moment, and threw the ship eight points off her course. After a quick scrape she got clear, but found afterwards that her guard wire was nearly cut through. On this trip the wireless apparatus was for a time out of order, but was successfully repaired; eight good ships were burnt or sunk, one of them being a supply ship of 5,000 tons. The return voyage was the most eventful of all. E. 14 came full against the net at Nagara, which had apparently been extended since she went up. The boat was brought up from 80 feet to 45 feet in three seconds, but broke away uninjured, with her bow and periscope standards scraped and scored.