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The Third Italian War of Independence was a conflict which paralleled the Austro-Prussian War, and was fought between the Kingdom of Italy and the Austrian Empire.
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Victor Emmanuel II of Savoy had been crowned King of Italy on March 17, 1861, his reign did not control Venetia and Lazio. The situation of the Irredente (a later Italian term for part of the country under foreign domination, literally meaning un-redeemed) created an unceasing state of tension for the inner politics of the newly created Kingdom, as well as being a cornerstone of its foreign policy.
A first attempt to capture Rome was that of 1862 by Giuseppe Garibaldi. Confiding in the King's neutrality, he had set sail from Genoa to Palermo. Collecting 1,200 volunteers, he moved from Catania and landed at Melito, in Calabria, on August 24 to reach the Aspromonte, with intention to climb the peninsula up to Rome. The Piedmontese general Enrico Cialdini, however, sent a division under colonel Pallavicino to stop the volunteer army. Garibaldi himself was wounded in the ensuing battle, and taken prisoner along with his men.
The growing divergences between Austria and the growing Prussia's predominance in Germany turned into an open war in 1866, offering Italy an occasion to regain Venetia. On April 8, 1866 the Italian government signed a military alliance with Prussia, through the mediation of Napoleon III of France. Italian armies, led by general Alfonso Ferrero La Marmora, were to engage the Austrians on the southern front. Simultaneously, taking advantage of their naval superiority, the Italians threatened the Dalmatian coast, forcing Austria to move part of its forces there from the central European front.
At the outbreak of the war, the Italian military situations was hampered by the following negative factors:
Prussia began hostilities on June 16, 1866 by attacking several German principates allied with Austria. Three days later Italy declared war on Austria, starting the military operations on June 23.
The Italian forces were divided into two armies: the first, under La Marmora himself, was deployed in Lombardy, west of the Mincio River, aiming toward the powerful Quadrilatero fortress of the Austrians; the second, under Enrico Cialdini, in Romagna, south of the Po River, aiming toward Mantua and Rovigo.
La Marmora moved first through Mantua and Peschiera del Garda, but was severely defeated at the Custoza on June 24. Cialdini, however, did not act offensively for the entire first part of the war, conducting only several shows and even failing to besiege the Austrian fortress of Borgoforte, south to the Po.
Custoza marked a general arrest of operations, as the Italians decided to reorganize for fear of an Austrian counter-offensive. The Austrians indeed profited from the situation to invade Valtellina and Val Camonica (battle of Vezza d'Oglio). The general course of the war, however, was to turn in Italy's favor thanks to Prussian victories in the north, especially that of Königgrätz on July 3, 1866. The Austrians were compelled to move one of their three army corps deployed in Italy to Vienna, concentrating on the defense of Trentino and Isonzo.
On July 5 the Italian government received news of a mediation effort by Napoleon III for a settlement of the situation, which would allow Austria to receive favourable conditions from Prussia, and, in particular, to maintain Venice. The situation was embarrassing for Italy, as its forces had failed to obtain any relevant military success on the field. As the Austrians were redeploying troops to Vienna, La Marmora was solicited to take advantage of the numeric superiority, score a good victory, and thus improve the conditions for Italy.
On July 14, during a council of war held in Ferrara, the new conduct of the war was decided, according to the following points:
Cialdini crossed the Po and occupied Rovigo (July 11), Padua (July 12), Treviso (July 14), San Donà di Piave (July 18), Valdobbiadene and Oderzo (July 20), Vicenza (July 21) and finally Udine, in Friuli (July 22). In the meantime Garibaldi's volunteers had pushed forward from Brescia towards Trento (see Invasion of Trentino) fighting victoriously at the battle of Bezzecca of July 21.
These victories were however obscured by the disastrous defeat of the bulk of the Italian army at the Battle of Custoza on June 24 and of the Italian Navy at the Battle of Lissa (July 20, 1866). On August 9, upon receiving from the King the order to retreat from the newly conquered positions, Garibaldi complied with his famous "Obbedisco!" ("I obey!") telegram, and retreated from Trentino.
The ceasing of hostilities was marked by the Armistice of Cormons signed on August 12, followed by the Treaty of Vienna of October 3, 1866.
The terms included the cession of Venetia (with Mantua and western Friuli) to France (which ceded it to Italy) and of the Iron Crown (worn by the old Lombard Kings of Italy and by the Holy Roman Emperors, as well as by Napoleon Bonaparte himself).
The Redente ("Redemeed") lands were annexed to Italy through a plebiscite held on October 21 and 22 of 1866.
This left only Rome and its Patrimony of St Peter (now Lazio) outside the Kingdom of Italy, until the "Capture of Rome" in September 1870 and the subsequent plebiscite approving its unification with the rest of Italy.
This article is a translation of an article in the Italian-language Wikipedia.