 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 organisations.They jointly formed the Jewish Resistance Movement.