There is at Verona some element in the Austrian councils of war which we don't understand, but which gives to their operations in this present phase of the campaign just as uncertain and as vacillating a character as it possessed during the campaign of 1859. On Friday they are still beyond the Mincio, and on Saturday their small fleet on the Lake of Garda steams up to Desenzano, and opens fire against this defenceless city and her railway station, whilst two battalions of Tyrolese sharp-shooters occupy the building. On Sunday they retire, but early yesterday they cross the Mincio, at Goito and Monzambano, and begin to throw two bridges over the same river, between the last-named place and the mills of Volta. At the same time they erect batteries at Goito, Torrione, and Valeggio, pushing their reconnoitring parties of hussars as far as Medole, Castiglione delle Stiviere, and Montechiara, this last-named place being only at a distance of twenty miles from Brescia. Before this news reached me here this morning I was rather inclined to believe that they were playing at hide-and-seek, in the hope that the leaders of the Italian army should be tempted by the game and repeat, for the second time, the too hasty attack on the quadrilateral. This news, which I have from a reliable source, has, however, changed my former opinion, and I begin to believe that the Austrian Archduke has really made up his mind to come out from the strongholds of the quadrilateral, and intends actually to begin war on the very battlefields where his imperial cousin was beaten on the 24th June 1859. It may be that the partial disasters sustained by Benedek in Germany have determined the Austrian Government to order a more active system of war against Italy, or, as is generally believed here, that the organisation of the commissariat was not perfect enough with the army Archduke Albert commands to afford a more active and offensive action. Be that as it may, the fact is that the news received here from several parts of Upper Lombardy seems to indicate, on the part of the Austrians, the intention of attacking their adversaries.