As the French squadron, which had engaged the forts in a most brilliant fashion, was passing out the Bouvet was blown up by a drifting mine and sank in less than three minutes, carrying with her most of her crew. At 2.36 P.M. the relief battleships renewed the attack on the forts, which again opened fire. The Turks were now sending mines down with the current. At 4.09 the Irresistible quitted the line, listing heavily, and at 5.50 she sank, having probably struck a drifting mine. At 6.05 the Ocean, also having struck a mine, sank in deep water. Practically the whole of the crews were removed safely. The Gaulois was damaged by gunfire; the Inflexible had her forward control position hit by a heavy shell, which killed and wounded the majority of the men and officers at that station and set her on fire. At sunset the forts were still in action, and during the twilight the Allied fleet slipped out of the Dardanelles. Meantime, an expeditionary force was being gathered. The largest portion of this force came from Great Britain, but France also provided a considerable number from her marines and from her Colonial army. Both nations avoided, as far as possible, drawing upon the armies destined for service in France. In the English army there were divisions from Australia and New Zealand and there were a number of Indian troops and Territorials. The whole force was put under the command of General Sir Ian Hamilton. The commander-in-chief on the Turkish side was the German General Liman von Sanders, the former chief of the military mission at Constantinople. The bulk of the expeditionary force, which numbered altogether about a hundred and twenty thousand men, were, therefore, men whose presence in the east did not weaken the Allied strength in the west. The great difficulty of the new plan was that it was impossible to surprise the enemy. The whole Gallipoli Peninsula was so small that a landing at any point would be promptly observed, and the nature of the ground was of such a character that progress from any point must necessarily be slow. The problem was therefore a simple one. The expeditionary force gathered in Egypt during the first half of April, and about the middle of the month was being sent to Lemnos. Germany was well aware of the English plans, and was doing all that it could to provide a defense. On April 23d the movement began, and about five o'clock in the afternoon the first of the transports slowly made its way through the maze of shipping toward the entrance of Mudros Bay.