It will be recalled that after Black Sabbath (Saturday), Menahem Begin received a letter from Moshe Sneh (chief of the Haganah General Headquarters) with instructions to blow up the King David. After preparatory work and several postponements, Irgun fighters gathered at 7 am. on Monday, July 22, 1946 at the Bet Aharon Talmud Torah seminary in Jerusalem. They arrived one by one, gave the password and assembled in one of the classrooms. They realized that they were being sent on a mission, but none of them knew what the target was. Shortly afterwards, the senior command arrived and it was only when the briefing began that the assembled fighters discovered that they were going to strike at the King David Hotel.

After the weapons had been distributed, the first unit - the group of "porters" - commanded by Yosef Avni, set out. Their assignment was to reach the hotel by bus and to wait at the side entrance so as to assist in unloading the explosives from the van when it arrived. All six "porters" were disguised as Arabs so as to avoid arousing suspicion. The strike force left next in a van loaded with seven milk-churns, each containing 50 kilograms of explosives and special detonators. The commander of the operation, Yisrael Levi (Gidon), rode in the van dressed as a Sudanese waiter, while his deputy, Heinrich Reinhold (Yanai), and the other members of the unit, were dressed as Arabs. The van drove through the streets of Jerusalem, its tarpaulin cover concealing the milk-churns and the passengers, and halted at the side entrance of the hotel, through which foodstuffs were brought into the basement 'La Regence' restaurant. The fighters easily overcame the guards by the gate and hastened to the basement, where they searched all the rooms, and assembled the workers in the restaurant kitchen. They then returned to the van, brought the milk-churns into the restaurant, and placed them beside the supporting pillars . Gidon set the time fuses for 30 minutes, and ordered his men to leave. The staff gathered in the kitchen were told to leave the building 10 minutes later to avoid injury.