six minesweepers in an attempt to clear the mines. Four of the trawlers were hit and Amethyst was badly damaged with nineteen stokers killed from one hit. On 15 March, the Admiralty accepted a plan by Carden for another attack by daylight, with the minesweepers protected by the fleet. Carden was taken ill the same day and was replaced by Rear Admiral John de Robeck. A gunnery officer noted in his diary that de Robeck had already expressed misgivings about silencing the Ottoman guns by naval bombardment and that this view was widely held on board the ship. Battle of 18 March The event that decided the battle took place on the night of 18 March when the Ottoman minelayer laid a line of mines in front of the Kephez minefield, across the head of Eren Köy Bay, a wide bay along the Asian shore just inside the entrance to the straits. The Ottomans had noticed the British ships turned to starboard into the bay when withdrawing. The new row of 20 mines ran parallel to the shore, were moored at and spaced about apart. The clear water meant that the mines could have been seen through the water by reconnaissance aircraft. The British plan for 18 March was to silence the defences guarding the first five minefields, which would be cleared overnight by the minesweepers. The next day the remaining defences around the Narrows would be defeated and the last five minefields would be cleared. The operation went ahead with the British and French ignorant of the recent additions to the Ottoman minefields. The battleships were arranged in three lines, two British and one French, with supporting ships on the flanks and two ships in reserve. The first British line opened fire from Eren Köy Bay around 11:00. Shortly after noon, de Robeck ordered the French line to pass through and close on the Narrows forts. The Ottoman fire began to take its toll with Gaulois, Suffren, Agamemnon and Inflexible suffering hits. While the naval fire had not destroyed the Ottoman batteries, it had succeeded in temporarily reducing their fire. By 13:25, the Ottoman defences were mostly silent so de Robeck decided to withdraw the French line and bring forward the second British line as well as Swiftsure and Majestic. The Allied forces had failed to properly sweep the entire area for mines. Aerial reconnaissance by aircraft from the