I have just learned from a most reliable source that the Austrians have mined the bridge of Borghetto on the Mincio, so that, should it be blown up, the only two, those of Goito and Borghetto, would be destroyed, and the Italians obliged to make provisional ones instead. I also hear that the Venetian towns are without any garrison, and that most probably all the forces are massed on two lines, one from Peschiera to Custozza and the other behind the Adige. You will probably know by this time that the garrison of Vienna had on the 3rd been directed to Prague. The news we receive from Prussia is on the whole encouraging, inasmuch as the greatly feared armistice has been repulsed by King William. Some people here think that France will not be too hard upon Italy for keeping her word with her ally, and that the brunt of French anger or disapproval will have to be borne by Prussia. This is the least she can expect, as you know! It is probable that by to-morrow I shall be able to write you more about the Italo-Austrian war of 1866. GONZAGA, July 9, 1866. I write you from a villa, only a mile distant from Gonzaga, belonging to the family of the Counts Arrivabene of Mantua. The owners have never reentered it since 1848, and it is only the fortune of war which has brought them to see their beautiful seat of the Aldegatta, never, it is to be hoped for them, to be abandoned again. It is, as you see, 'Mutatum ab illo.' Onward have gone, then, the exiled patriots! onward will go the nation that owns them! The wish of every one who is compelled to remain behind is that the army, that the volunteers, that the fleet, should all cooperate, and that they should, one and all, land on Venetian ground, to seek for a great battle, to give the army back the fame it deserves, and to the country the honour it possesses. The king is called upon to maintain the word nobly given to avenge Novara, and with it the new Austrian insulting proposal. All, it is said, is ready. The army has been said to be numerous; if to be numerous and brave, means to deserve victory, let the Italian generals prove what Italian soldiers are worthy of. If they will fight, the country will support them with the boldest of resolutions--the country will accept a discussion whenever the Government, having dispersed all fears, will proclaim that the war is to be continued till victory is inscribed on Italy's shield.