 Under his direction, dozens of combat operations were planned and carried out, a portion of them as part of the Jewish Resistance Movement during which the three underground movements (Haganah, Irgun, Lehi) joined forces against the British.During this period, the railyards near the Haifa port were attacked, the Sarona military headquarters (today HaKirya in Tel Aviv) was bombed, Sarafand (today Tzrifin military base) was attacked, the CID offices in Haifa were attacked, airplanes at the Kfar Sirkin air base were destroyed, hospitalized prisoners were freed as were female prisoners from the Petah Tikva police station, and he participated in a bank robbery at the Tel Aviv branch of the Barclays Bank.Banai pioneered the use of explosive vehicles, which were used against the CID offices in Haifa, the Sarona military headquarters and the Jaffa Sarai.