The fete-de-poet is thrown upon the Po; its structure is of recent date, and it consists of a central part and of two wings, called Rocchetta and Bocca di Ganda respectively. The lock here existing is enclosed in the Rocchetta work. Since I wrote you my last letter Garibaldi has been obliged to desist from the idea of getting possession of Bagolino, Sant' Antonio, and Monte Suello, after a fight which lasted four hours, seeing that he had to deal with an entire Austrian brigade, supported by uhlans, sharp-shooters (almost a battalion) and twelve pieces of artillery. These positions were subsequently abandoned by the enemy, and occupied by Garibaldi's volunteers. In this affair the general received a slight wound in his left leg, the nature of which, however, is so very trifling, that a few days will be enough to enable him to resume active duties. It seems that the arms of the Austrians proved to be much superior to those of the Garibaldians, whose guns did very bad service. The loss of the latter amounted to about 100 killed and 200 wounded, figures in which the officers appear in great proportion, owing to their having been always at the head of their men, fighting, charging, and encouraging their comrades throughout. Captain Adjutant-Major Battino, formerly of the regular army, died, struck by three bullets, while rushing on the Austrians with the first regiment. On abandoning the Caffaro line, which they had reoccupied after the Lodrone encounter--in consequence of which the Garibaldians had to fall back because of the concentration following the battle of Custozza--the Austrians have retired to the Lardara fortress, between the Stabolfes and Tenara mountains, covering the route to Tione and Trento, in the Italian Tyrol. The third regiment of volunteers suffered most, as two of their companies had to bear the brunt of the terrible Austrian fire kept up from formidable positions. Another fight was taking place almost at the same time in the Val Camonico, i.e., north of the Caffaro, and of Rocca d'Anfo, Garibaldi's point d'appui. This encounter was sustained in the same proportions, the Italians losing one of their bravest and best officers in the person of Major Castellini, a Milanese, commander of the second battalion of Lombardian bersaglieri. Although these and Major Caldesi's battalion had to fall back from Vezza, a strong position was taken near Edalo, while in the rear a regiment kept Breno safe.