In 1917, al-Khisas lay north of the Sykes Picot line, a straight line between the midpoint of the Sea of Galilee and Nahariya in the area to be incorporated under a French sphere of influence. The Syria-Lebanon-Palestine boundary was a product of the post-World War I Anglo-French partition of Ottoman Syria. British forces had advanced to a position at Tel Hazor against Turkish troops in 1918 and wished to incorporate all the sources of the river Jordan within the boundaries of British controlled Palestine. Due to the French inability to establish administrative control, the frontier between Syria and Palestine became 'fluid'. The international boundary between Palestine and Syria was finally set by joint agreement between Great Britain and France in 1923 in conjunction with the Treaty of Lausanne, after Britain had been given a League of Nations Mandate for Palestine in 1922; thus, al-Khisas came under British jurisdiction.