|Damaged periscope of the E-11|
By the next morning, the 24th, the E-11 was on the hunt again and soon spotted a large, civilian steamer. In accordance with the rules of the sea at that time, Naismith surfaced his boat and ordered the steamer to stop so that the crew could be offloaded before sinking the vessel. The ship did not stop though until the British sailors opened fire on it with their small arms. The crew were evacuated and Lt. D’Oyly-Hughes was sent onboard with a demolition charge that was later set off, sending the ship (which was found to be carrying a large amount of guns and ammunition) to the bottom. After spotting another target, E-11 submerged and stealthily followed it right into the harbor. The sub hit the bottom but Naismith kept pressing forward through the ever shallower water, determined to get his shot. As the water became more shallow the top masts of the sub were exposed and soon they were under Turkish small arms fire but Naismith kept his cool, lined up the shot and destroyed the transport with a single torpedo.
The E-11 dove deep and headed back into the Sea of Marmara, having put a good scare into the enemy. Over the next two weeks Naismith and his crew sunk a transport and about a dozen dhows until they were down to only 2 torpedoes and, as the engineer discovered, they had a crack in one of their propeller shafts. It looked like it was time to head back to base in the Mediterranean. On June 6th the E-11 headed back, escaping unscathed though there was one very hair-raising incident as a naval mine was snagged on one of their diving planes. Naismith had to go deep, reverse engines and surface stern-first to get un-stuck from the deadly device. Once back to Malta the E-11 was fixed up and fitted with a 12-pounder deck gun. In the meantime, the E-11 having proven the viability of such an operation, the British had sent more subs into the Sea of Marmara and virtually cleared it of enemy shipping. However, the E-11 was not done yet. In August Naismith and his men returned just as the Allies were mounting another push on Gallipoli. Severing Turkish supply lines would be extremely beneficial.
The E-11 surfaced and Naismith and his crew began shelling the bridge with their new deck gun. However, the Turks were well prepared and began returning fire with their shore batteries. Finally, Naismith had no choice but to order his men below and submerge to the safety of the depths. However, no one wanted to give up and Lt. D’Oyly-Hughes volunteered to go ashore, alone and blast the bridge with a demolition charge. Naismith gave the order and the intrepid British officer crept ashore, dodging Turkish troops and some noisy chickens in a nearby farm. However, the entire bridge was lit up like Broadway as teams worked to repair the damage the E-11 had inflicted the night before in their shelling. D’Oyly-Hughes was dismayed but still determined to strike a blow for King and country. He found another bridge, actually an enormous trestle over a dry-wash ravine that was even larger than the Izmit Bridge they had first targeted. D’Oyly-Hughes set his charge and then opened fire on a camp of Turkish soldiers with his pistol to distract them. He dashed back to the shore, dodging bullets along the way but his mission was a success. He made it back to the submarine and a huge section of the Berlin-Bagdad Railway went up in an enormous explosion. For his exploit on shore, Lt. D’Oyly-Hughes was awarded the Distinguished Service Order.