 This action was immediately repudiated by the British and French and the San Remo Conference was called together by the League of Nations in April 1920 to explicitly establish the mandate of the French over Syria.Shortly, the war of Syrian Arab nationalists with the French became a devastating campaign for the new proclaimed Arab Kingdom of Syria.Several violent incidents in the region initiated by Arab militias, like the Battle of Tel Hai, led to further international support of the French.