In 1838, there were roughly 4,000 Muslim and 100 Christian tax payers, implying a population of about 15,000 or 16,000—making it larger than Jerusalem at the time. The total number of Christian families was 57. Before the outbreak of World War I, the population of Gaza had reached 42,000; however, the fierce battles between Allied Forces and the Ottomans and their German allies in 1917 in Gaza resulted in a massive population decrease. The following census, which was conducted in 1922 by the British Mandate authorities shows a sharp decrease in population which stood at 17,480 residents, consisting of 16,722 Muslims, 54 Jews and 701 Christians.