First Arab–Israeli War and UN Arms Embargo

Immediately following the declaration of the new state, both superpower leaders, US President Harry S. Truman and Soviet leader Joseph Stalin, recognized the new state. The Arab states marched their forces into what had, until the previous day, been the British Mandate for Palestine, starting the first Arab–Israeli War. After an initial loss of territory by the Jewish state, the tide turned in the Israelis' favour and they pushed the Arab armies back beyond the borders of the proposed Arab state. On 29 May 1948, the British initiated United Nations Security Council Resolution 50 declaring an arms embargo on the region. Czechoslovakia violated the resolution, supplying the Jewish state with critical military hardware to match the (mainly British) heavy equipment and planes already owned by the invading Arab states. On 11 June, a month-long UN truce was put into effect. Following independence, the Haganah became the Israel Defense Forces (IDF). The Palmach, Etzel and Lehi were required to cease independent operations and join the IDF. During the ceasefire, Etzel attempted to bring in a private arms shipment aboard a ship called 'Altalena'. When they refused to hand the arms to the government, Ben-Gurion ordered that the ship be sunk. Several Etzel members were killed in the fighting. Large numbers of Jewish immigrants, many of them World War II veterans and Holocaust survivors, now began arriving in the new state of Israel, and many joined the IDF. After an initial loss of territory by the Jewish state and its occupation by the Arab armies, from July the tide gradually turned in the Israelis' favour and they pushed the Arab armies out and conquered some of the territory that had been included in the proposed Arab state. At the end of November, tenuous local ceasefires were arranged between the Israelis, Syrians and Lebanese. On 1 December King Abdullah announced the union of Transjordan with Arab Palestine west of the Jordan; only Britain and Pakistan recognized the annexation.