On 3 November 1914, Churchill ordered the first British attack on the Dardanelles following the opening of hostilities between Turkey and Russia. The attack was carried out by "Indomitable" and "Indefatigable", as well as the French pre-dreadnought battleships "Suffren" and "Vérité". The intention of the attack was to test the fortifications and measure the Turkish response. The results were deceptively encouraging. In a twenty-minute bombardment, a single shell struck the magazine of the fort at Sedd el Bahr at the tip of the Gallipoli peninsula, displacing (but not destroying) 10 guns and killing 86 Turkish soldiers. The most significant consequence was that the attention of the Turks was drawn to strengthening their defences, and they set about expanding the mine field. This attack actually took place before a formal declaration of war had been made by Britain against the Ottoman Empire which didn't happen until the 5th. "Indomitable" was ordered to return to England in December where she joined the 2nd BCS.