Mantua lies on an island, being cut off on all sides from the main land by the branches of the Mincio, and approachable only by five narrow causeways, of which three were defended by strong and regular fortresses or entrenched camps, the other two by gates, drawbridges, and batteries. Situated amidst stagnant waters and morasses, its air is pestilential, especially to strangers. The garrison were prepared to maintain the position with their usual bravery; and it remained to be seen whether the French general possessed any new system of attack, capable of abridging the usual operations of the siege, as effectually as he had already done by those of the march and the battle. His commencement was alarming: of the five causeways, by sudden and overwhelming assaults, he obtained four; and the garrison were cut off from the main land, except only at the fifth causeway, the strongest of them all, named, from a palace near it, _La Favorita_. It seemed necessary, however, in order that this blockade might be complete, that the Venetian territory, lying immediately beyond Mantua, should be occupied by the French. The power of this ancient government was no longer such as to inspire much respect, and Buonaparte resolved that the claim of neutrality should form no obstacle to his measures. The French Directory had already most ungenerously trampled on the dignity of Venice, by demanding that she should no longer afford a retreat to the illustrious exile, the Count of Provence, eldest surviving brother of Louis XVI.[9] That unfortunate prince had, accordingly, though most reluctantly, been desired to quit the Venetian states, and had already passed to the Rhine, where his gallant cousin, the Prince of Condé, had long been at the head of a small and devoted army composed of the expatriated gentry of France. Buonaparte, however, chose to treat the reluctance with which Venice had been driven to this violation of her hospitality, as a new injury to his government: he argued that a power who had harboured in friendship, and unwillingly expelled, the _Pretender_ to the French monarchy, had lost all title to forbearance on the part of the Revolutionary forces. This was a gross and ungenerous insult, and it was a gratuitous one; for he had a far better argument behind. The imperial general had, as we have seen, neglected the reclamations of the Doge, when it suited his purpose to occupy Peschiera. "You are too weak," said Buonaparte, when the Venetian envoy reached his headquarters, "to enforce neutrality on hostile nations such as France and Austria. Beaulieu did not respect your territory when his interest bade him violate it; nor shall I hesitate to occupy whatever falls within the line of the Adige." In effect, garrisons were placed forthwith in Verona, and all the strong places of that domain. The tricolor flag now waved at the mouth of the Tyrolese passes; and Napoleon, leaving Serrurier to blockade Mantua,