At the beginning of hostilities between Britain and the Ottoman Empire in November 1914, the 30,000 strong British defence force evacuated the part of the Sinai Peninsula that was east of the canal, concentrating their defences on the western side of the canal. The British force comprised the 10th, and 11th Indian Divisions, the Imperial Service Cavalry Brigade, the Bikaner Camel Corps, three batteries of Indian mountain artillery and one Egyptian artillery battery. These were supported by the guns of Allied ships in the canal. Opposing them were around 25,000 men, including the 25th Division. The Ottoman Empire demonstrated its interest in being reinstated in Egypt in 1915 when Ottoman forces attacked British forces in Egypt. The Germans also helped to foment unrest among the Senussi in what is now Libya, when they attacked western Egypt and threatened the Sudan during the Senussi Campaign.