 By the end of March, the tactic proved its worth and the city was cut off.The Haganah then launched "Operation Nachshon", 4–20 April, and managed to force through a number of large convoys.Following the death of Abd al-Qader al-Husayni at al-Qastal, the Arab League's military committee ordered the other Arab force in Palestine, the Arab Liberation Army, to move its forces from Samaria (the northern part of today's West Bank) to the road of Jerusalem and the areas of Latrun, Ramla, and Lydda.