We have said that Napoleon's strategy was the result of this personal magnetism. Later critics evolved from his success the theory of "interior lines," and then accounted for it by applying the criterion they had evolved. Actually, the form in which the will to conquer found expression was in many important respects old. What, therefore, in the theory or its application was the product of Napoleon's own genius and will-power? A comparison with Souham's campaign of Tourcoing will enable us to answer this question. To begin with, Souham found himself midway between Coburg and Clerfayt almost by accident, and his utilization of the advantages of his position was an expedient for the given case. Napoleon, however, placed himself _deliberately_ and by fighting his way thither, in an analogous situation at Carcare and Cairo. Military opinion of the time considered it dangerous, as indeed it was, for no theory can alter the fact that had not Napoleon made his men fight harder and march farther than usual, he would have been destroyed. The effective play of forces on interior lines depends on the two conditions that the outer enemies are not so near together as to give no time for the inner mass to defeat one before the arrival of the other, and that they are not so far apart that before one can be brought to action the other has inflicted serious damage elsewhere. Neither condition was fully met at any time in the Montenotte campaign. On the 11th Napoleon knew that the attack on Voltri had been made by a part only of the Austrian forces, yet he flung his own masses on Montenotte. On the 13th he thought that Beaulieu's main body was at Dego and Colli's at Millesimo, and on this assumption had to exact the most extraordinary efforts from Augereau's troops at Cossaria. On the 19th and 20th he tried to exclude the risks of the Austrians' intervention, and with this the chances of a victory over them to follow his victory over Colli, by transferring the centre of gravity of his army to Ceva and Garessio, and fighting it out with Colli alone.