A few days after the outbreak of war, David Ben-Gurion declared that “We must help the (British) army as if there was no White Book, and we must fight in the White Book as if there were no war.” Indeed, little by little the number of recruits from the Yishuv in the Land of Israel increased. Among the recruits were students and graduates of the Technion. Starting in June 1940, many of them were recruited into the British Corps of Engineers, thanks to their professional training. The fact that the members of this corps were involved in the movement of trains in the Middle East and then in Europe enabled them to also engage in extensive underground activity.”