During this time , and independently of Haganah or the framework of Plan Dalet , irregular troops from Irgun and Lehi formations massacred 107 Arabs at Deir Yassin . The event that was publicly deplored and criticized by the principal Jewish authorities had a deep effect on the morale of the Arab population . At the same time , the first large-scale operation of the Arab Liberation Army ended in a " débâcle " , as they were roundly defeated at Mishmar HaEmek . Their Druze allies left them through defection
Deir Yassin
Deir Yassin massacre
1947–1949 Palestine war