Once the river Po crossed by Cialdini's corps d'armee, he will boldly enter the Polesine and make himself master of the road which leads by Rovigo towards Este and Padua. A glance at the map will show your readers how, at about twenty or thirty miles from the first-mentioned town, a chain of hills, called the Colli Euganei, stretches itself from the last spur of the Julian Alps, in the vicinity of Vicenza, gently sloping down towards the sea. As this line affords good positions for contesting the advance of an army crossing the Po at Lago Scuro, or at any other point not far from it, it is to be supposed that the Austrians will make a stand there, and I should not be surprised at all that Cialdini's first battle, if accepted by the enemy, should take place within that comparatively narrow ground which is within Montagnana, Este, Terradura, Abano, and Padua. It is impossible to suppose that Cialdini's corps d'armee, being so large, is destined to cross the Po only at one point of the river below its course: it is extremely likely that part of it should cross it at some point above, between Revere and Stellata, where the river is in two or three instances only 450 metres wide. Were the Italian general to be successful--protected as he will be by the tremendous fire of the powerful artillery he disposes of--in these twofold operations, the Austrians defending the line of the Colli Euganei could be easily outflanked by the Italian troops, who would have crossed the river below Lago Scuro. Of course these are mere suppositions, for nobody, as you may imagine, except the king, Cialdini himself, Lamarmora, Pettiti, and Menabrea, is acquainted with the plan of the forthcoming campaign. There was a rumour at Cialdini's headquarters to-day that the Austrians had gathered in great numbers in the Polesine, and especially at Rovigo, a small town which they have strongly fortified of late, with an apparent design to oppose the crossing of the Po, were Cialdini to attempt it at or near Lago Scuro. There are about Rovigo large tracts of marshes and fields cut by ditches and brooks, which, though owing to the dryness of the season [they] cannot be, as it was generally believed two weeks ago, easily inundated, yet might well aid the operations the Austrians may undertake in order to check the advance of the Italian fourth corps d'armee. The resistance to the undertaking of Cialdini may be, on the part of the Austrians, very stout, but I am almost certain that it will be overcome by the ardour of Italian troops, and by the skill of their illustrious leader.