Ilan pappe takes about Plan Dalet , a plan that David Ben-Gurion and the Haganah leaders in Palestine worked out during autumn 1947 to spring 1948 , and explains the details of the plan , and how was it performed . Historian Ilan Pappe talks about Plan Dalet , a plan that David Ben-Gurion and the Haganah leaders in Palestine worked out during autumn 1947 to spring 1948 .