The 1948 Arab–Israeli War (15 May 1948 – 10 March 1949), also known as the First Arab–Israeli War, followed the civil war in Mandatory Palestine (29 November 1947 – 14 May 1948) as the second and final stage of the 1948 Palestine war. The civil war became a war of separate states with the Israeli Declaration of Independence on 14 May 1948, the end of the British Mandate for Palestine at midnight, and the entry of a military coalition of Arab states into the territory of Mandatory Palestine the following morning. The war formally ended with the 1949 Armistice Agreements which established the Green Line.
Since the 1917 Balfour Declaration and the 1920 creation of the British Mandate of Palestine, and in the context of Zionism and the mass migration of European Jews to Palestine, there had been tension and conflict between Arabs, Jews, and the British in Palestine. On 29 November 1947, the United Nations General Assembly voted in favor of the United Nations Partition Plan for Palestine, proposing to divide the territory into an Arab state, a Jewish state, and an internationally
administered corpus separatum for the cities of Jerusalem and Bethlehem. The land allocated to the
Arab State included about 43% of Mandatory Palestine. The land allocated to the Jewish State,
who constituted a third of the population, was 56% of Mandatory Palestine. While Jewish leaders
in Palestine supported the plan, leaders of the Palestinian Arab community and in the broader
Arab world did not. The following day, the conflict escalated into a civil war with attacks by Palestinian militias and mobs on Jewish areas. As the two communities battled, the British withdrew.
In April 1948, Zionist forces launched an offensive codenamed Plan Dalet, during which they conquered and depopulated cities, villages, and territories in Mandatory Palestine in preparation for the establishment of a Jewish state. Just before the expiration of the British Mandate for Palestine, Zionist leaders announced the Israeli Declaration of Independence on 14 May 1948. The following morning, Egypt, Transjordan, Syria, and expeditionary forces from Iraq launched an invasion into Palestine, taking control of the Arab areas and attacking Israeli forces and settlements. The 10 months of fighting took place mostly on the territory of the British Mandate and in the Sinai Peninsula and southern Lebanon, interrupted by several truce periods.
By the end of the war, the State of Israel controlled about 78% of the former territory of Mandatory Palestine: all of the area that the UN had proposed for a Jewish state, as well as almost 60% of the area proposed for an Arab state, including Jaffa, Lydda and Ramla (Ramle) area, Upper Galilee, some parts of the Negev, the west coast as far as Gaza City, and a wide strip along the Tel Aviv–Jerusalem road. Israel also took control of West Jerusalem, which was meant to be part of an international zone for Jerusalem and its environs. Transjordan took control of East Jerusalem and what became known as the West Bank, annexing it the following year. The territory known today as the Gaza Strip was occupied by Egypt.
Expulsions of Palestinians, which had begun during the civil war, continued during the Arab-Israeli war. Hundreds of Palestinians were killed in multiple massacres, such as occurred in the expulsions from Lydda and Ramla. These events are known today as the Nakba (Arabic for "the catastrophe") and were the beginning of the Palestinian refugee problem. A similar number of Jews migrated, fled, or were expelled from Arab states in the three years following the war, 260,000 of whom went to Israel.
Since the 1917 Balfour Declaration and the 1920 creation of the British Mandate of Palestine, and in the context of Zionism and the mass migration of European Jews to Palestine, there had been tension and conflict between Arabs, Jews, and the British. British policies dissatisfied both Arabs and Jews. In 1920, the Arab leaders were very disappointed with Britain. In 1916, the British commander-in-chief in Cairo had made an agreement with the Emir of Mecca: if the Arabs rebelled against the Ottoman Empire, the British would provide them with arms and money and support the formation of an independent Arab state. Around 30,000 older rifles and a smaller amount of modern weapons were supplied by the British, and a very large area from the Red Sea to Damascus was conquered.
Britain backtracked from its promise that an independent Arab state would be formed. In 1920, Britain let French troops attack the Arab Kingdom of Syria, crushing its army and overthrowing its government. Arab opposition developed into the 1936–1939 Arab revolt in Palestine, while the Jewish opposition developed into the 1944–1947 Jewish insurgency in Palestine. On 29 November 1947, the United Nations General Assembly adopted a resolution recommending the adoption and implementation of a plan to partition the British Mandate of Palestine into two states, one Arab and one Jewish, and the City of Jerusalem.
The General Assembly resolution on Partition was greeted with overwhelming joy in Jewish communities and widespread outrage in the Arab world. In Palestine, violence erupted almost immediately, feeding into a spiral of reprisals and counter-reprisals. The British refrained from intervening as tensions boiled over into a low-level conflict that quickly escalated into a full-scale civil war.
From January onwards, operations became increasingly militarised, with the intervention of a number of Arab Liberation Army regiments inside Palestine, each active in a variety of distinct sectors around the different coastal towns. They consolidated their presence in Galilee and Samaria. Abd al-Qadir al-Husayni came from Egypt with several hundred men of the Army of the Holy War. Having recruited a few thousand volunteers, al-Husayni organised the blockade of the 100,000 Jewish residents of Jerusalem.
To counter this, the Yishuv authorities tried to supply the city with convoys of up to 100 armoured vehicles, but the operation became more and more impractical as the number of casualties in the relief convoys surged. By March, Al-Hussayni's tactic had paid off. Almost all of Haganah's armoured vehicles had been destroyed, the blockade was in full operation, and hundreds of Haganah members who had tried to bring supplies into the city were killed. The situation for those who dwelt in the Jewish settlements in the highly isolated Negev and north of Galilee was even more critical.
While the Jewish population had received strict orders requiring them to hold their ground everywhere at all costs, the Arab population was more affected by the general conditions of insecurity to which the country was exposed. Up to 100,000 Arabs, from the urban upper and middle classes in Haifa, Jaffa and Jerusalem, or Jewish-dominated areas, evacuated abroad or to Arab centres eastwards.
This situation caused the United States to withdraw its support for the Partition Plan, encouraging the Arab League to believe that the Palestinian Arabs, reinforced by the Arab Liberation Army, could put an end to the plan. However, the British decided on 7 February 1948 to support the annexation of the Arab part of Palestine by Transjordan.
Although doubt took hold among Yishuv supporters, their apparent defeats were due more to their wait-and-see policy than to weakness. David Ben-Gurion reorganised Haganah and made conscription obligatory. Every Jewish man and woman in the country had to receive military training. Thanks to funds raised by Golda Meir from sympathisers in the United States, and Stalin's decision to support the Zionist cause, the Jewish representatives of Palestine were able to sign very important armament contracts in the East. Other Haganah agents recovered stockpiles from the Second World War, which helped improve the army's equipment and logistics. Operation Balak allowed arms and other equipment to be transported for the first time by the end of March.