On 14 May 1948 Israel declared the establishment of the State of Israel based on the UN Partition Plan. The Jordanian Arab Legion under the leadership of Sir John Bagot Glubb, known as Glubb Pasha was given orders to enter Palestine, secure the UN designated Arab area, and then enter the Jerusalem corpus separatum as defined by the UN Partition Plan. See 1948 Arab-Israeli War Third phase: May 15, 1948 - June 11, 1948.