After the Israeli Declaration of Independence on 14 May 1948 and the start of the 1948 Arab–Israeli War, Irgun continued to fight alongside Haganah and Lehi. On 15 May 1948, Begin broadcast a speech on radio declaring that the Irgun was finally moving out of its underground status. On 1 June Begin signed an agreement with the provisional government headed by David Ben-Gurion, where the Irgun agreed to formally disband and to integrate its force with the newly formed Israel Defense Forces (IDF), but was not truthful of the armaments aboard the "Altalena" as it was scheduled to arrive during the cease-fire ordered by the United Nations and therefore would have put the State of Israel in peril as Britain was adamant the partition of Jewish and Arab Palestine would not occur. This delivery was the smoking gun Britain would need to urge the UN to end the partition action.