The armed conflict escalated during the final phase of the World War II , when the Irgun declared a revolt in February 1944 , ending the hiatus in operations it had begun in 1940 . Starting from the assassination of Walter Guinness , 1st Baron Moyne in 1944 , the Haganah actively opposed the Irgun and Lehi , in a period of inter-Jewish fighting known as The Hunting Season . However , in autumn 1945 , following the end of End of World War II in Asia ( September , 1945 ) , the Haganah began a period of co-operation with the two other underground organizations . They jointly formed the Jewish Resistance Movement . The Haganah refrained from direct confrontation with British forces , and concentrated its efforts on attacking British immigration control , while Irgun and Lehi attacked military and police targets . The Resistance Movement dissolved in recriminations in July 1946 , following the King David Hotel bombing . The Irgun and Lehi started acting independently , while the main underground militia Haganah acted mainly in supporting Jewish immigration to Mandatory Palestine . After the United Nations ' partition plan resolution was passed on 29 November 1947 , the civil war between Palestinian Jews and Arabs eclipsed the previous tensions of both with the British
King David Hotel bombing
King David Hotel bombing
Jewish insurgency in Mandatory Palestine