Rubuta ci gaba don wannan sakin layi - An kafa shi daga tsoffin ƙungiyoyin 'yan bindiga, ainihin manufarsa ita ce kare ƙauyukan Yahudawa daga hare-haren Larabawa, kamar tarzoma na 1920, 1921, 1929
da kuma lokacin 1936-1939 Arab tawaye a Palestine. Ya kasance a ƙarƙashin ikon Hukumar Yahudawa, hukuma ta hukuma da ke kula da al'ummar Yahudawa na Falasdinu a lokacin mulkin Birtaniya. Har zuwa ƙarshen Yaƙin Duniya na Biyu, ayyukan Haganah sun kasance masu matsakaici, daidai da manufar havlaga (" kame kai"), wanda ya haifar da rarrabuwar Irgun da Lehi masu tsattsauran ra'ayi. Kungiyar ta sami tallafin soja na asirce daga Poland. Haganah ta nemi hadin kai tare da Birtaniyya a yayin mamayewar Axis na Falasɗinu ta Arewacin Afirka, wanda ya haifar da ƙirƙirar ƙungiyar aikin Palmach a 1941.