Andy and I have written about the origins of “vulnerability thinking” and many dimensions of vital systems security in total war and strategic bombing. In reading Churchill’s “Their Finest Hour,” the second volume of his four-volume series of World War II, I came across a couple interesting nuggets along these lines. In World War II, concern with vital systems was essential to strategic thought on both sides, and at certain points was the dominant consideration. After the fall of France, when Hitler turned his attention to Britain, there was a kind of military stalemate, or at least a situation in which neither side could turn its major strength on the other. The overwhelmingly dominant German army was prevented from invasion across the channel by British naval dominance. Churchill claims that he never believed that Germany could launch a successful invasion. As a consequence, the major concerns revolved around attacks on vital systems. Churchill writes that he considered German u-boat attacks on shipping to be the most serious strategic threat, and the Germans engaged in various forms of terror bombing and strategic bombing during the Battle of Britain, particularly on major centers of industrial production (particularly aircraft production — which seems to have been rather concentrated). Churchill also has some very interesting things to say about vital systems and civil defense, among which the following about preparations for a German invasion. Note the interesting use of quotes around ‘vulnerable points’ — perhaps it was something of a neologism at the time:
Obstacles were placed on many thousand square miles of Britain to impede the landing of air-borne troops. All our aerodromes, radar stations, and fuel depots…needed defence by special garrisons and by their own airmen. Many thousands of ‘vulnerable points’ — bridges, power-stations, depots, vital factories, and the like — had to be guarded day and night from sabotage or sudden onset….The destruction of port facilities, the cratering of key roads, the paralysis of motor transport and of telephones and telegraph stations, of rolling stock or permanent way, before they passed out of our hands were planned to the last detail. Yet, despite all these wise and necessary precautions…there was no question of a scorched earth policy. England was to be defended by its people, not destroyed (p. 177).