The purpose of the plan was, according to its Jewish planners, a contingency plan for defending a Jewish state from invasion. According to Yoav Gelber and most of the historians , Plan D was primarily defensive in nature. According to other sources it was a plan with the purpose of conquering as much of Palestine as possible and to expel as many Palestinians as possible (see 'Plan Dalet: Master Plan for the Conquest of Palestine', by Walid Khalidi, for example).
Source: Wikipedia > Plan Dalet
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