 The Haganah actively cooperated with the British in suppressing the Irgun, effectively halting the insurrection.However, after the end of World War II in Europe (April–May 1945), when it became clear that the British would not permit significant Jewish immigration and had no intention of immediately establishing a Jewish state, the Haganah joined with the Irgun and Lehi in a rebellion against British rule.The rebellion's activities expanded to attacking military targets.