The inhabitants, at length aroused to their danger by the presence of an army whom they supposed at Siena, were thrown into general panic, though some were so blinded as to suppose it the advanced guard of the confederates. Even now, bold and judicious expedients might have defended the walls until the arrival of the allies, whose first division actually reached the Porta Salara the same day on which the city was taken; and had the bridges been previously cut, as was urged upon Renzo in consideration of the weak defences of the Borgo S. Spirito, the principal portion of the city might have held out, even after these had been carried, whilst the Duke of Urbino would have had leisure to execute signal vengeance upon the ruffian invaders, demoralised by their leader's fall and by the pillage of its Transteverin quarters. It is by no means easy to form an idea of the actual force of the invading army from the varying estimates that have come down to us. Muratori, who bestowed much attention upon such military statistics, reckons the troops whom Bourbon carried from Milan at about five thousand Spaniards, four thousand Germans, and half as many Italians, besides five hundred men-at-arms, two thousand German cavalry, and an indefinite number of light horse, to whom were soon united the lansquenets of Fründesberg, originally fourteen thousand, but already somewhat reduced. This would give a total of twenty-six or twenty-seven thousand men, which exceeds by a few thousand infantry the calculation adopted by Giacomo Buonaparte, his multiplication of the men-at-arms by ten being obviously an accidental error. The same author supposes that the Imperialists who had marched from Montevarchi were about twenty thousand Germans, eight thousand Spaniards, three thousand Italians, with but six hundred horse. The impression current at Rome, and in the confederate camp, that Bourbon brought from forty to fifty thousand men before that city was therefore grossly exaggerated; indeed, some authorities diminish his effective force to half that number, while Buonaparte esteems it under thirty thousand. The allied army, according to Baldi, was twenty thousand strong, of whom one fifth were cavalry: but it, too, had melted away when mustered at Isola, as we shall in due time see. On the whole, it appears that the inequality of numbers was not such as to justify the Fabian tactics, or it may be the petted policy, of Francesco Maria.