The efforts of the Allies to force the Strait of the Dardanelles reached their climax in an artillery duel on Thursday, March 18, which lasted seven hours. The entire atmosphere around the Turkish forts was darkened by clouds of smoke from exploding shells and quantities of earth thrown into the air by the projectiles of the French and British warships. The earth trembled for miles around. The Allies entered the strait at 11:30 in the morning, and shelled the town of Chank Kale. Four French and five British warships took part in the beginning. This engagement reached its climax at 1:30, when the fire of the Allies was concentrated upon Fort Hamidieh and the adjacent fortified positions. The attack of modern marine artillery upon strong land forts presented an interesting as well as a terrifying spectacle. At times the forts were completely enveloped in smoke. At 2 o'clock the Allies changed their tactics and concentrated their fire upon individual batteries, but it was evident that they found difficulty in getting the range. Many of the shells fell short, casting up pillars of water, or went over the forts to explode in the town. At 3:15, when the bombardment was at its hottest, the French battleship Bouvet was seen to be sinking at the stern. A moment later her bows swung clear of the water, and she was seen going down. Cheers from the Turkish garrisons and forts greeted this sight. Torpedo boats and other craft of the Allies hurried to the rescue, but they were successful in saving only a few men. Besides having been struck by a mine, the Bouvet was severely damaged above the water line by shell fire. One projectile struck her forward deck. A mast also was shot away and hung overboard. It could be seen that the Bouvet when she sank was endeavoring to gain the mouth of the strait. This, however, was difficult, owing, apparently, to the fact that her machinery had been damaged. Shortly after the sinking of the Bouvet a British ship was struck on the deck squarely amidship and compelled to withdraw from the fight. Then another British vessel was badly damaged, and at 3:45 was seen to retire under a terrific fire from the Turkish battery. This vessel ran in toward the shore. For a full hour the Allies tried to protect her with their guns, but it was apparent that she was destined for destruction. Eight effective hits showed the hopelessness of the situation for this vessel. She then withdrew toward the mouth of the Dardanelles, which she reached in a few minutes under a hail of shells. The forts continued firing until the Allies were out of range.