A little history:
Great Britain declared war on Turkey in November, 1914. This was followed in December by Britain declaring Egypt to be a British protectorate. The ruler was deposed and his uncle, Hussein Kamil (or Kamel), was proclaimed sultan of Egypt, so ending Turkey's nominal sovereignty over Egypt. In October 1917 Hussein Kamil died and was succeeded by his brother. Throughout the war, Egypt was used as a base for British military operations against the Turks in the Middle East, and the Suez Canal was successfully defended against a Turkish attack in 1915.