As early as February 1948, David Ben-Gurion had drawn up a plan for the conquest of the whole of Jerusalem, including the Palestinian quarters, although the city and its environs were envisioned as a corpus separatum under a United Nations trusteeship according to the UN partition recommendation of 29 November 1947. Ben-Gurion's plan was divided into two phases. During Phase 1 (to be implemented until the end of the British Mandate on 15 May 1948), a principal objective was "to seize every military and political opportunity to control the residential quarters of the enemy in order to produce geographic Jewish contiguity throughout the city and to move Jews into these quarters as their inhabitants leave them." Phase 2 was to be implemented once the British left; its objective was "the liberation of the Old City and the whole of Jerusalem."
Operation Jevussi was launched on April 26 to implement Phase 1. By April 30 most of the Palestinian quarters in West Jerusalem (see 327, 328, 332) and some in East Jerusalem had been occupied and their inhabitants expelled. On 14 May 1948 Operation Klashon completed the work of Jevussi outside the Old City. On the same day Operation Schfifon was launched for the conquest of the Old City, which was all of Jerusalem that remained in Palestinian hands. Only the heroism of its defenders and the belated intervention, on 19 May 1948, of units of the Arab Legion of Transjordan prevented the fall of the Old City with the rest of East Jerusalem and their annexation by Ben-Gurion in 1948.