Haganah (Hebrew: "The Defense", ההגנה HaHagana) was a Jewish paramilitary organization in what was then the British Mandate of Palestine from 1920 to 1948, which later became the core of the Israel Defense Forces. After the 1920 Arab riots and 1921 Jaffa riots, the Jewish leadership in Palestine believed that the British, to whom the League of Nations had given a mandate over Palestine in 1920, had no desire to confront local Arab gangs which frequently attacked Palestinian Jews. Believing that they could not rely on the British administration for protection from these gangs, the Jewish leadership created the Haganah to protect Jewish farms and kibbutzim. In addition to guarding Jewish communities, the role of the Haganah was to warn the residents of and repel attacks by Palestinian Arabs. In the period between 19201929, the Haganah lacked a strong central authority or coordination. Haganah "units" were very localized and poorly armed: they consisted mainly of Jewish farmers who took turns guarding their farms or their kibbutzim. Following the 1929 Palestine riots, the Haganah's role changed dramatically. It became a much larger organization encompassing nearly all the youth and adults in the Jewish settlements, as well as thousands of members from the cities. It also acquired foreign arms and began to develop workshops to create hand grenades and simple military equipment, transforming from an untrained militia to a capable underground army. Some Bedouins had long standing ties with nearby Jewish communities. They helped defend these communities in the 19361939 Arab revolt in Palestine. During the 1948 Arab-Israeli War, some Bedouins of Tuba formed an alliance with the Haganah defending Jewish communities in the Upper Galilee against Syria. Some were part of a Pal-Heib unit of the Haganah. Sheik Hussein Mohammed Ali Abu Yussef of Tuba was quoted in 1948 as saying, "Is it not written in the Koran that the ties of neighbors are as dear as those of relations? Our friendship with the Jews goes back many years. We felt we could trust them and they learned from us too".