But both the natural position and fortifications of the town appeared to defy attacks. Surrounded on the side of Brabant with insurmountable works and moats, and towards Flanders covered by the broad and rapid stream of the Scheldt, it could not be carried by storm; and to blockade a town of such extent seemed to require a land force three times larger than that which the duke had, and moreover a fleet, of which he was utterly destitute. Not only did the river yield the town all necessary supplies from Ghent, it also opened an easy communication with the bordering province of Zealand. For, as the tide of the North Sea extends far up the Scheldt, and ebbs and flows regularly, Antwerp enjoys the peculiar advantage that the same tide flows past it at different times in two opposite directions. Besides, the adjacent towns of Brussels, Malines, Ghent, Dendermonde, and others, were all at this time in the hands of the league, and could aid the place from the land side also. To blockade, therefore, the town by land, and to cut off its communication with Flanders and Brabant, required two different armies, one on each bank of the river. A sufficient fleet was likewise needed to guard the passage of the Scheldt, and to prevent all attempts at relief, which would most certainly be made from Zealand. But by the war which he had still to carry on in other quarters, and by the numerous garrisons which he was obliged to leave in the towns and fortified places, the army of the duke was reduced to ten thousand infantry and seventeen hundred horse, a force very inadequate for an undertaking of such magnitude. Moreover, these troops were deficient in the most necessary supplies, and the long arrears of pay had excited them to subdued murmurs, which hourly threatened to break out into open mutiny. If, notwithstanding these difficulties, he should still attempt the siege, there would be much occasion to fear from the strongholds of the enemy, which were left in the rear, and from which it would be easy, by vigorous sallies, to annoy an army distributed over so many places, and to expose it to want by cutting off its supplies. All these considerations were brought forward by the council of war, before which the Duke of Parrna now laid his scheme. However great the confidence which they placed in themselves, and in the proved abilities of such a leader, nevertheless the most experienced generals did not disguise their despair of a fortunate result. Two only were exceptions, Capizucchi and Mondragone, whose ardent courage placed them above all apprehensions; the rest concurred in dissuading the duke from attempting so hazardous an enterprise, by which they ran the risk of forfeiting the fruit of all their former victories and tarnishing the glory they had already earned.