"Undoubtedly, as was understood by IDF intelligence, the most important single factor in the exodus of April–June was Jewish attack. This is demonstrated clearly by the fact that each exodus occurred during or in the immediate wake of military assault. No town was abandoned by the bulk of its population before the Haganah/IZL assault. In the countryside, while many of the villages were abandoned during Haganah/IZL attacs and because of them, other villages were evacuated as result of Jewish attacks on neighbouring villages or towns; they feared that they would be next. In General, Haganah operational orders for attacks on towns did not call for the expulsion or eviction of the civilian population. But from early April, operational orders for attacks on villages and clusters of villages more often than not called for the destruction of villages and, implicitly or explicitly, expulsion. And, no doubt, the spectacle of panicky flight served to whet the appetites of Haganah commanders and, perhaps, the HGS as well. Like Ben Gurion, they realised that a transfer of the prospective large minority out of the emergent Jewish State had begun and that with very little extra effort and nudging it could be expanded. The temptation proved very strong, for solid military and political reasons."
January 1, 1970
https://en.wikiquote.org/wiki/1948_Palestinian_exodus