The Haganah

The Haganah was the principal defense organization of the Jewish community and the Zionist movement in Palestine during the British Mandate, operating from 1920 until the establishment of the State of Israel in 1948. It began as a dispersed and poorly equipped network protecting Jewish neighborhoods and settlements. Over the course of three decades, it developed into a nationwide organization with central command, regional formations, intelligence, communications, medical and engineering services, weapons production, maritime and air units, training systems and a substantial underground infrastructure. When Israel was established, the Haganah provided the personnel, commanders and institutional framework from which the Israel Defense Forces were created.

From Local Defense to a Nationwide Organization

The Haganah emerged amid the violence of 1920 and the growing recognition that Jewish communities could not depend entirely on external authorities for their security. Its founders sought a broad popular organization under the authority of the institutions of the Yishuv, rather than a small, autonomous guard corps. In December 1920, with the creation of the Histadrut, defense and guarding became part of its responsibilities. The Haganah was defined as a national organization open to members regardless of political, social or economic background. Women served in its ranks from the beginning.

During the 1920s, the organization struggled with inadequate funds, limited weapons and weak coordination among local committees. The riots of 1921 exposed its inability to protect every community, while the events of 1929 revealed the consequences of decentralization, insufficient manpower and the absence of a unified command. Yet the Haganah also demonstrated that organized local defense could save lives. These experiences led the Yishuv’s leadership to invest in a more coordinated and professional force.

Building a Military Infrastructure under the Mandate

From the early 1930s, the Haganah established a national command, a general staff and regional structures. Settlements were organized into blocs and districts, enabling the movement of instructors, weapons and reinforcements. The organization expanded its training courses, communications and intelligence networks, and developed units capable of operating both inside settlements and beyond their boundaries.

During the Arab Revolt of 1936–1939, the Haganah changed from a primarily defensive force into a more flexible operational organization. In cooperation with the British, its members served in the Palestine Police and the Jewish Settlement Police, guarding railways, ports, airports, strategic roads, power facilities and other vital sites. These arrangements gave Haganah personnel access to training, weapons and operational experience, while also allowing the organization to use legal or semi-legal frameworks for its own purposes.

At the same time, the Haganah formed mobile patrols, the Special Night Squads, the Field Companies and other units that developed the doctrine known as “going out beyond the fence.” Instead of waiting inside isolated settlements, fighters conducted patrols, ambushes and planned operations against attacking forces. The experience helped create a new generation of commanders and established habits of discipline, mobility and coordinated action.

The Haganah also helped establish the “Tower and Stockade” settlements. Its members protected the rapid construction of new communities in exposed areas, linking defense with settlement and strengthening the geographic foundations of the future state.

Weapons Procurement, Industry and Youth Training

Because the British restricted Jewish arms acquisition, the Haganah developed clandestine procurement networks abroad and smuggled rifles, machine guns, grenades and ammunition into Palestine. It also built a domestic weapons industry. Ta’as grew from small workshops into a network of factories, foundries and laboratories producing grenades, explosives, ammunition and mortar bombs. This capacity became crucial during the 1948 war, when the Jewish community faced shortages, embargoes and the demands of sustained combat.

Training extended beyond adult fighters. From 1939, the Haganah sponsored Hagam, a program in Jewish schools combining physical education, fieldcraft and hand-to-hand combat. In 1941 it established Gadna for teenagers aged fifteen to eighteen. Participants learned drill, scouting, first aid and the use of small arms, while assisting with guard duty, leafleting and other organizational tasks. These programs connected security with civic responsibility and prepared thousands of young people for service in the institutions of the future state.

Immigration, the Palmach and World War II

The Haganah played a major role in bringing Jews to Palestine. From the 1930s it cooperated with pioneering movements in Europe to organize clandestine immigration, and in 1939 it became involved in the creation of Mossad LeAliyah Bet, the central institution for illegal immigration. Haganah personnel prepared ships, provided communications and intelligence, guided vessels and helped land immigrants on the coast. Before World War II, more than 6,000 immigrants reached Palestine in sixteen ships through this effort. Between 1945 and 1948, the expanded operation brought more than 70,000 immigrants on sixty-four ships.

During World War II, the Haganah cooperated with Britain against Nazi Germany even as the Mandate continued to restrict Jewish immigration and settlement. The danger of a German advance toward Palestine encouraged broad recruitment and the creation of trained Jewish military units. In 1941 the Palmach was established as a full-time, mobile force. It became one of the Yishuv’s most important military formations and later supplied a core of experienced commanders and fighters for the War of Independence.

Haganah emissaries also assisted Jewish refugees in Europe, supported the Bricha escape movement and helped train young survivors and immigrants who would later serve in the war. In this way, the organization’s activity linked the defense of the Yishuv with the rescue and resettlement of Jews displaced by the Holocaust.

Resistance to Britain and Preparation for Statehood

After World War II, Britain continued to restrict immigration and opposed the establishment of a Jewish state. The Haganah therefore joined the Hebrew Resistance Movement. In 1945 and 1946, Haganah and Palmach forces carried out operations including the liberation of approximately 200 detainees from the Atlit camp, the Night of the Trains, attacks on radar stations and the Night of the Bridges, when ten bridges were destroyed across the country. These actions sought to disrupt the mechanisms blocking immigration and to keep the question of Jewish statehood before international opinion.

At the same time, the Haganah prepared for a full-scale confrontation with Arab armies. It organized the Guard Corps, the Field Corps and the Palmach, and created infantry, armored and Palmach brigades. Alongside them stood air, naval, engineering, artillery, medical, communications, supply and storage services. This was no longer merely a collection of local underground groups. It was the framework of a modern army, with recruitment, instruction, intelligence, logistics and operational planning.

The War of Independence and the Birth of the IDF

Following the United Nations partition resolution of November 29, 1947, the Haganah led the main defense of the Jewish community. It fought for the roads to Jerusalem and isolated settlements, defended mixed cities and communities in the Galilee and Negev, and organized partially armored convoys under constant attack. The struggle for the roads, especially the route to Jerusalem, caused heavy losses and demonstrated the limits of static defense. It also accelerated the transition to large, coordinated offensive operations.

In the spring of 1948, the Haganah launched Operation Nachshon to open the road to Jerusalem and fought major battles at Mishmar HaEmek. Its forces captured Tiberias, Haifa, Safed, Jaffa and strategic areas in the Galilee and central regions, while opening routes toward Jerusalem and the Negev. Plan Dalet concentrated the organization’s forces into brigades and battalions and improved the Yishuv’s strategic position before the invasion of the Arab states. These achievements rested on years of training, procurement, weapons manufacture, intelligence, organization and settlement activity.

When Arab armies invaded in May 1948, Haganah brigades and specialized services held the various fronts and continued the fighting that had begun under the Mandate. At the end of May, amid the War of Independence, the Haganah became the Israel Defense Forces. Its commanders, fighters, technical services and institutional practices gave the new state the foundation it needed to wage a war for survival.

Why the Haganah Belongs in Moreshet

The Haganah merits inclusion in Moreshet because its contribution extended far beyond battlefield defense. It protected communities, helped bring refugees and immigrants to Palestine, supported new settlements, trained young people, developed a domestic arms industry and created the military and civic infrastructure of a state in the making. Its influence can be seen not only in the War of Independence but also in the institutions, professional traditions and public responsibilities that shaped Israeli life afterward.

The Haganah’s legacy is the story of a community without sovereignty organizing itself to protect life, preserve Jewish continuity and build the institutions of independence. For that reason, it belongs naturally in the archive of Jewish and Israeli heritage maintained by Moreshet and documented through Moreshet.com.