29 April, in Artaki Bay near Panderma, AE2 was sighted and hit by the Ottoman torpedo boat . Abandoning ship, the crew was taken prisoner. The second submarine through the straits had more luck than AE2. On 27 April, (Lieutenant-Commander Edward Boyle), entered the Sea of Marmara and went on a three-week sortie that was one of the most successful actions of the Allies in the campaign. The quantity and value of the shipping sunk was relatively minor but the effect on Ottoman communications and morale was significant. On his return, Boyle was immediately awarded the Victoria Cross. Boyle and E14 made a number of tours of the Sea of Marmara. His third tour began on 21 July, when he passed the straits, despite the Ottomans having installed an anti-submarine net near the Narrows. (Lieutenant-Commander Martin Nasmith) also cruised the Sea of Marmara and Nasmith was awarded the VC and promoted to Commander for his achievements. E11 sank or disabled eleven ships, including three on 24 May at the port of Rodosto on the Thracian shore. On 8 August, during a later tour of the Marmara, E11 torpedoed the . A number of demolition missions were performed by men or parties landed from submarines. On 8 September, First Lieutenant H. V. Lyon from swam ashore near Küçükçekmece (Thrace) to blow up a railway bridge. The bridge was destroyed but Lyon failed to return. Attempts were also made to disrupt the railways running close to the water along the Gulf of İzmit, on the Asian shore of the sea. On the night of 20 August, Lieutenant Guy D'Oyly-Hughes from E11 swam ashore and blew up a section of the railway line. On 17 July, bombarded the railway line and then damaged two trains that were forced to halt. French attempts to enter the Sea of Marmara continued. Following the success of AE2 and E14, the French submarine attempted the passage on 1 May but she struck a mine and was lost with all hands. The next attempt was made by on 27 July. Mariotte was caught in the anti-submarine net that E14 had eluded and was forced to the surface. After being shelled from the shore batteries, Mariotte was scuttled. On 4 September, the same net caught E7 as it began another tour. The first French submarine to enter the Sea of Marmara was but it was forced to turn back