The Arab Revolt broke out again in the autumn of 1937. The British ended the revolt using harsh measures, deporting many Palestinian Arab leaders and shutting down the AHC. In the Yishuv, the Arab Revolt reinforced the already firm belief in the need for a strong Jewish defence network. Finally, the Arab agricultural boycott that began in 1936 forced the Jewish economy into even greater self-sufficiency. The Haganah during this period changed from being a small clandestine militia to a large military force. The British security forces at this time cooperated with the Haganah to respond to the Arabs.