Archduke Albert, commander-in-chief of the Austrian army of the South, care of the governor of Mantua. After the major had delivered the receipt, the three messengers entered into a courteous conversation, during which Colonel Bariola seized an opportunity of presenting the duke, purposely laying stress on the fact of his belonging to one of the most illustrious families of Naples. It happened that the Austrian major had also been trained in the same school where Colonel Bariola was brought up--a circumstance of which he was reminded by the Austrian officer himself. Three hours had scarcely elapsed from the arrival of the two Italian messengers of war at Le Grazie, on the Austrian frontier, when they were already on their way back to the headquarters of Cremona, where during the night the rumour was current that a telegram had been received by Lamarmora from Verona, in which Archduke Albert accepted the challenge. Victor Emmanuel, whom I saw at Bologna yesterday, arrived at Cremona in the morning at two o'clock, but by this time his Majesty's headquarters must have removed more towards the front, in the direction of the Oglio. I should not be at all surprised were the Italian headquarters to be established by to-morrow either at Piubega or Gazzoldo, if not actually at Goito, a village, as you know, which marks the Italian-Austrian frontier on the Mincio. The whole of the first, second, and third Italian corps d'armee are by this time concentrated within that comparatively narrow space which lies between the position of Castiglione, Delle Stiviere, Lorrato, and Desenzano, on the Lake of Garda, and Solferino on one side; Piubega, Gazzoldo, Sacca, Goito, and Castellucchio on the other. Are these three corps d'armee to attack when they hear the roar of Cialdini's artillery on the right bank of the Po? Are they destined to force the passage of the Mincio either at Goito or at Borghetto? or are they destined to invest Verona, storm Peschiera, and lay siege to Mantua? This is more than I can tell you, for, I repeat it, the intentions of the Italian leaders are enveloped in a veil which nobody--the Austrians included--has as yet been able to penetrate. One thing, however, is certain, and it is this, that as the clock of Victor Emmanuel marks the last minute of the seventy-second hour fixed by the declaration delivered at Le Grazie on Wednesday by Colonel Bariola to the Austrian major, the fair land where Virgil was born and Tasso was imprisoned will be enveloped by a thick cloud of the smoke of hundreds and hundreds of cannon. Let us hope that God will be in favour of right and justice, which, in this imminent and fierce struggle, is undoubtedly on the Italian side. CREMONA, June 30, 1866.