At the beginning of the nineteenth century it was generally believed that great hardships, colds, lack of the necessaries of life, and the consequent consumption of spoiled foodstuffs give rise to fevers, and that these fevers, in accordance with the epidemic character of the year and of the season, and also in accordance with the severity of the hardships undergone, might develop into dysentery and typhus fever. At all events, even the eminent physicians of the day, men like Hildenbrand of Vienna[106] and Hufeland of Berlin, who in the course of two decades had abundant opportunity to study the disease, assumed that it is possible for typhus fever to break out spontaneously. It was believed that this fever, originating spontaneously, gradually developed the power of infection. Hufeland’s position was self-contradictory, for he assumes that the disease can break out spontaneously and yet that it can be warded off by means of isolation.[107] He says: ‘A proof of the fact that this disease can spread only through infection is offered by the stronghold of Küstrin, which, being closed up tightly during the entire year of 1813, was free from disease, whereas all the surrounding country, even the army of the besiegers, suffered terribly.’ Whereupon Hufeland immediately adds: ‘The war carried on among us and by us with such unheard-of exertion and hardship caused the disease to break out several times anew throughout our country, and hence it could but become general.’ That it is possible for typhus fever to break out spontaneously and subsequently spread by infection was everywhere believed, even by French physicians. It is hardly necessary to say, however, that the theory of the spontaneous origination of the disease does not accord with modern views. The severe hardships undergone, the hunger and cold, the effluvium of gangrenous wounds, the moral depression, and the many other bad effects which characterized this war more than any other, necessarily decreased the soldiers’ power of resistance and increased their susceptibility to infection. Incidentally, all sorts of telluric and meteorological phenomena, volcanic eruptions, earthquakes, the great heat and dryness of the year 1811, the meteors of that year—all these things were at the time brought into causal connexion with the war pestilences of the years 1813–14.