Alvinzi's error, which was a very gross one, consisted in supposing that no more than Joubert's inconsiderable force was stationed at Rivoli, and in preparing, therefore, to destroy him at his leisure; when his acquaintance with the French celerity of movement[220] ought to have prepared him for the possibility of Buonaparte's night march, by which, bringing up the chosen strength of his army into the position where the enemy only expected to find a feeble force, he was enabled to resist and defeat a much superior army, brought to the field upon different points, without any just calculation on the means of resistance which were to be opposed; without the necessary assistance of cavalry and artillery; and, above all, without a preconcerted plan of co-operation and mutual support. The excellence of Napoleon's manœuvres was well supported by the devotion of his generals, and the courage of his soldiers. Massena, in particular, so well seconded his general, that afterwards, when Napoleon, as Emperor, conferred on him the title of Duke, he assigned him his designation from the battle of Rivoli.[221] Almost before this important and decisive victory was absolutely gained, news arrived[222] which required the presence of Buonaparte elsewhere. On the very same day of the battle, Provera, whom we left manœuvring on the Lower Adige, threw a bridge of pontoons over that river, where the French were not prepared to oppose his passage, and pushed forward to Mantua, the relief of which fortress he had by stratagem nearly achieved. A regiment of his cavalry, wearing white cloaks, and resembling, in that particular, the first regiment of French hussars, presented themselves before the suburb of Saint George, then only covered by a mere line of circumvallation. The barricades were about to be opened without suspicion, when it occurred to a sagacious old French sergeant, who was beyond the walls gathering wood, that the dress of this regiment of white cloaks was fresher than that of the French corps, called Bertini's, for whom they were mistaken. He communicated his suspicions to a drummer who was near him; they gained the suburb, and cried to arms, and the guns of the defences were opened on the hostile cavalry, whom they were about to have admitted in the guise of friends.[223] [Sidenote: Jan. 16] About the time that this incident took place, Buonaparte himself arrived at Roverbella, within twelve miles of Mantua, to which he had marched with incredible despatch from the field of battle at Rivoli, leaving to Massena, Murat, and Joubert, the task of completing his victory, by the close pursuit of Alvinzi and his scattered forces. [Sidenote: BATTLE OF LA FAVORITA.]