Irgun in the context of "1948 Palestinian expulsion and flight"

The Israel Defense Forces (IDF; Hebrew: צבא הגנה לישראל, romanized: Tsva Hagana le-Yisra'el, lit. 'Army for the Defense of Israel'), alternatively referred to by the Hebrew-language acronym Tzahal (צה״ל), is the national military of the State of Israel. It consists of three service branches: the Israeli Ground Forces, the Israeli Air Force, and the Israeli Navy. It is the sole military wing of the Israeli security apparatus. The IDF is headed by the chief of the general staff, who is subordinate to the defense minister.

On the orders of first prime minister David Ben-Gurion, the IDF was formed on 26 May 1948 and began to operate as a conscript military, drawing its initial recruits from the already existing paramilitaries of the Yishuv—namely Haganah, the Irgun, and Lehi. It was formed shortly after the Israeli Declaration of Independence and has participated in every armed conflict involving Israel. In the wake of the 1979 Egypt–Israel peace treaty and the 1994 Israel–Jordan peace treaty, the IDF underwent a significant strategic realignment. Previously spread across various fronts—Lebanon and Syria in the north, Jordan and Iraq in the east, and Egypt in the south—the IDF redirected its focus towards southern Lebanon and the Palestinian territories. In 2000, the IDF withdrew from Southern Lebanon and in 2005 from Gaza. Conflict between Israel and Islamist groups based in Gaza, notably Hamas, has continued since then. Moreover, notable Israeli–Syrian border incidents have occurred frequently since 2011, due to regional instability caused by the Syrian civil war.

The Jewish insurgency in Mandatory Palestine, known in the United Kingdom as the Palestine Emergency, was a paramilitary campaign carried out by Zionist militias and underground groups—including Haganah, Lehi, and Irgun—against British rule in Mandatory Palestine from 1944 to 1948. The tensions between the Zionist underground and the British mandatory authorities rose from 1938 and intensified with the publication of the White Paper of 1939. The Paper outlined new government policies to place further restrictions on Jewish immigration and land purchases, and declared the intention of giving independence to Palestine, with an Arab majority, within ten years. Though World War II brought relative calm, tensions again escalated into an armed struggle towards the end of the war, when it became clear that the Axis powers were close to defeat.

The Haganah, the largest of the Jewish underground militias, which was under the control of the officially recognised Jewish leadership of Palestine, remained cooperative with the British. But in 1944 the Irgun, an offshoot of the Haganah, launched a rebellion against British rule, thus joining Lehi, which had been active against the authorities throughout the war. Both were small, dissident militias of the right-wing Revisionist movement. They attacked police and government targets in response to British immigration restrictions.

The history of the Jews in Poland dates back at least 1,000 years. For centuries, Poland was home to the largest and most significant Jewish community in the world. Poland was a principal center of Jewish culture, because of the long period of statutory religious tolerance and social autonomy which ended after the Partitions of Poland in the 18th century. During World War II there was a nearly complete genocidal destruction of the Polish Jewish community by Nazi Germany and its collaborators of various nationalities, during the German occupation of Poland between 1939 and 1945, called the Holocaust. Since the fall of communism in Poland, there has been a renewed interest in Jewish culture, featuring an annual Jewish Culture Festival in Kraków, new study programs at Polish secondary schools and universities, and the opening of Warsaw's Museum of the History of Polish Jews.

From the founding of the Kingdom of Poland in 1025 until the early years of the Polish–Lithuanian Commonwealth created in 1569, Poland was the most tolerant country in Europe. Poland became a shelter for Jews persecuted and expelled from various European countries and the home to the world's largest Jewish community of the time. According to some sources, about three-quarters of the world's Jews lived in Poland by the middle of the 16th century. With the weakening of the Commonwealth and growing religious strife (due to the Protestant Reformation and Catholic Counter-Reformation), Poland's traditional tolerance began to wane from the 17th century. After the Partitions of Poland in 1795 and the destruction of Poland as a sovereign state, Polish Jews became subject to the laws of the partitioning powers, including the increasingly antisemitic Russian Empire, as well as Austria-Hungary and Kingdom of Prussia (later a part of the German Empire). When Poland regained independence in the aftermath of World War I, it was still the center of the European Jewish world, with one of the world's largest Jewish communities of over 3 million. Antisemitism was a growing problem throughout Europe in those years, from both the political establishment and the general population. Throughout the interwar period, Poland supported Jewish emigration from Poland and the creation of a Jewish state in Palestine. The Polish state also supported Jewish paramilitary groups such as the Haganah, Betar, and Irgun, providing them with weapons and training.

The Israeli Ground Forces (Hebrew: זרוע היבשה, romanized: z'róa hibshá, lit. 'Land arm') are the ground forces of the Israel Defense Forces (IDF). The current commander of the ground forces is Major General Nadav Lotan.

An order from Defense Minister David Ben-Gurion on 26 May 1948 officially set up the Israel Defense Forces as a conscript army formed out of the paramilitary group Haganah, incorporating the militant groups Irgun and Lehi. The Ground Forces have served in all the country's major military operations—including the 1948 Arab–Israeli War, 1956 Suez Crisis, 1967 Six-Day War, 1973 Yom Kippur War, 1976 Operation Entebbe, 1982 Lebanon War, 1987–1993 First Intifada, 2000–2005 Second Intifada, 2006 Lebanon War, and the Gaza War (2008–09). While originally the IDF operated on three fronts—against Lebanon and Syria in the north, Jordan and Iraq in the east, and Egypt in the south—after the 1979 Egyptian–Israeli Peace Treaty, it has concentrated in southern Lebanon and the Palestinian territories, including the First and the Second Intifada.

Haganah (Hebrew: הַהֲגָנָה ha-Haganah, lit. 'The Defense') was the main Zionist paramilitary organization that operated for the Yishuv in the British Mandate for Palestine. It was founded in 1920 to defend the Yishuv's presence in the region, and was formally disbanded in 1948, when it became the core force integrated into the Israel Defense Forces shortly after the Israeli Declaration of Independence.

Formed out of previous existing militias, Haganah's original purpose was to defend Jewish settlements against Arab attacks; this was the case during the 1921 Jaffa riots, the 1929 Palestine riots, the 1936 Jaffa riots, and the 1936–1939 Arab revolt in Palestine, among others. The paramilitary was under the control of the Jewish Agency, the official governmental body in charge of Palestine's Jewish community during the British era. Until the end of World War II, Haganah's activities were moderate, in accordance with the strategic policy of havlagah (lit. 'self-restraint'), which caused the breakaway of the more radical paramilitaries: Irgun and Lehi. Haganah militants received clandestine military support from Poland and sought cooperation with the United Kingdom in the event of an Axis-led invasion of Palestine through North Africa, prompting the creation of the Palmach, their elite fighting force, in 1941.

Lehi (Hebrew pronunciation: [ˈleχi]; Hebrew: לח״י, sometimes abbreviated "LHI"), officially the Fighters for the Freedom of Israel (Hebrew: לוחמי חרות ישראל, romanized: Lohamei Herut Israel) and often known pejoratively as the Stern Gang, was a Zionist paramilitary militant organization founded by Avraham ("Yair") Stern in Mandatory Palestine. Its avowed aim was to evict the British authorities from Palestine by use of violence, allowing unrestricted immigration of Jews and the formation of a Jewish state. It was initially called the National Military Organization in Israel, upon being founded in August 1940, but was renamed Lehi one month later. The group referred to its members as terrorists and admitted to having carried out acts of terrorism.

Lehi split from the Irgun militant group in 1940 in order to continue fighting the British during World War II. It initially sought an alliance with Fascist Italy and Nazi Germany. Believing that Nazi Germany was a lesser enemy of the Jews than Britain, Lehi twice attempted to form an alliance with the Nazis, proposing a Jewish state based on "nationalist and totalitarian principles, and linked to the German Reich by an alliance". After Stern's death in 1942, the new leadership of Lehi began to move towards support for Joseph Stalin's Soviet Union and the ideology of National Bolshevism, which was considered an amalgam of both right and left. Regarding themselves as "revolutionary Socialists", the new Lehi developed a highly original ideology combining an "almost mystical" belief in Greater Israel with support for the Arab liberation struggle. This sophisticated ideology failed to gain public support and Lehi fared poorly in the first Israeli elections.