The Saudi Ikhwan began to conflict with Hussein, Sharif of Mecca also in 1917, just as his sons Abdullah and Faisal entered Damascus. The Treaty of Darin remained in effect until superseded by the Jeddah conference of 1927 and the Dammam conference of 1952, during both of which Ibn Saud extended his boundaries past the Anglo-Ottoman Blue Line. After Darin, he stockpiled the weapons and supplies which the British provided him, including a 'tribute' of £5,000 per month.[17] After World War I, he received further support from the British, including a glut of surplus munitions.