Invasion of Trentino (1866)

The Invasion of Trentino was a series of military operation undertaken by the Kingdom of Italy against the Austrian Empire during the Third Italian War of Independence of 1866, which was part of the larger Austro-Prussian War.

Background
At the outbreak of the third Italian war of Independence (June 23, 1866), Giuseppe Garibaldi received the order to take up positions with his volunteer force the "Corpo Volontari Italiani" along the frontline between Lombardy and the south most part of the County of Tyrol which today corresponds to the Italian province of Trentino.

Initially Garibaldi could only muster 4 battalions, but in the end managed to obtain some 38,000 men, which were to face the roughly 15,000 Austrian regulars under general baron Franz von Kuhn. The Austrians were supported by their fleet on Lake Garda.

First actions
Garibaldi's men started the fights on June 21, 1866. After some initial minor clashes, they were, due to the Italian defeat at the Battle of Custoza ordered to retreat to the south-western tip of Lake Garda on June 25. As the Austrians choose not pursue, Garibaldi renewed his advance on July 3, but was wounded during an attack on an enemy mountain position. Nonetheless the advance of the Cacciatori was successful and on July 12th Storo and Condino were occupied.

Contemporarily, actions took place near the Tonale Pass, where 3,000 Austrians had established a defensive line between Vezza d'Oglio and Temù. During the battle of Vezza d'Oglio, July 4 the Austrians were dislodged from their positions by an attack of the Italian regular Bersaglieri infantry, which suffered heavy losses. On July 2 an Austrian column crossed the Stelvio Pass and captured Bormio and the Mortirolo Pass, but was later defeated by a force from the Italian National Guard (see Operations in Valtellina).

Condino
Although apparently feeble, the Austrian moves were part of a larger offensive planned by Kuhn which aimed to outflank Garibaldis positions from Lardaro and Bezzecca. On July 16th an Austrian column ousted the Italians from Cimego. Three columns were now encircling the Italians at Condino, but Garibaldi took advantage of his numerical superiority and of the strength of his defensive position and was able to defeat the attack on (July 16th), which forced the Austrians to retreat to their starting positions.

In the following days the Italians marched northwards until, on July 20th, they occupied Bezzecca. As the Austrians had suffered a decisive defeat at the Battle of Sadowa, Kuhn had only a few days left before part of his troops would be sent to augment the defense of Vienna. Profiting from the situation, the Italians began to advance on the southern front too, when a division under Giacomo Medici was sent from Padua to fight its way to the city of Trento.

Battle of Bezzecca
On July 21 two Austrian columns clashed with the Hunters of the Alps at the Battle of Bezzecca. After some initial Austrian successes, Garibaldi's counterattacks finally forced them to retreat from Bezzecca as well as from Cimego and Condino.

The Italian commander had now opened the road to Trento, while Medici had successfully swept the Austrian troops from the Valsugana, reaching Civezzano, not far from Trento, on July 25th. Kuhn was preparing to be besieged in Trento, and had received orders to concentrate on the defense of South Tyrol in the case further defeats.

On July 25th and 26th the Italians attacked near Riva del Garda, but were defeated. However, a truce signed on July 24th, ended all operations. On August 9th the Italian troops received the order to leave Trentino, as a treaty of peace between Italy and Austria was forthcoming. Garibaldi, from the square of Bezzecca, replied with his famous: "Obbedisco!" ("I obey!"). Hostilities finally ceased with the Armistice of Cormons (August 12, 1866).