The Battle of Doss Alto was a minor military engagement between the troops of Austria-Hungary and Italy on the Italian front of World War I on 21 September 1918. The battle took place on the Doss Alto di Nago hill in northern Italy. Italian regiments, composed of the members of Czechoslovak Legion in Italy, were able to defend their post on the hillside against Austro-Hungarians. Victory later became the most commemoraded battle of the legions on the Italian warfare.

Since 1916 Austro-Hungarian Army prisoners of war of Czech and Slovak origin in Italy started to form volunteer legions, which then joined Italian Royal Army on the warfare against Austro-Hungarian troops. Number of enlisted men was growing and during the summer of 1918 Czechoslovak volunteers formed the 6th Czechoslovak Division, which consisted of the 31st, 32nd, 33rd, and 34th Infantry Regiments, under the command of Italian general Andrea Graziani (1864–1931).

In August 1918, this division moved to the front where it took up a position in a sector about 20 kilometers long between Lago di Garda and the Adige River. Their task was to guard this sector on the site of Altissimo mountain massif, with Doss Alto di Nago hill (703 meters above sea level), near Nago-Torbole, as a central point.

On 21 September, the Austro-Hungarian units consisting of Riva Assault Battalion, significantly outnumbering the enemy, tried to capture trenched fortifications of Doss Alto, occupied by the soldiers of 33rd and 34th Czechoslovak Rifle Regiments. The Austro-Hungarian attack began in the morning around 4:00 a.m. with a strong two-hour artillery barrage directed mainly at the Czechoslovak positions. This was followed by an bayonet attack on the top of Doss Alto from the northwest and northeast. The main weight of the defense was borne by the 33rd Czechoslovak Regiment, which, after being reinforced by reserves, successfully managed to retook previously captured trenches and defend the position.

During the clast 7 Czechoslovak legionnaires died, 31 were wounded and 4 fell into Austrian captivity and were later hanged in Arc as deserters. Two of the fallen, lieutenants František Svoboda and Oldřich Trojánek, were officers. Trojánek committed suicide by shooting himself with a revolver at his advanced post after being surrounded and threatened with capture, which for him would also mean a promped execition. 51 Austro-Hungarian soldiers was killed, 90 wounded and 60 captured.

Military action caught the attention of Italian government and helped the fact, that on 3 October 1918 Italy started the process of accepting the Czechoslovak National Council in Paris as a de facto government of future Czechoslovakia.

During the First Czechoslovakian Republic era the battle was a solid part of a heroic narrative of Czechoslovak Legions in Italy. In 1938, the battle was commemorated by issuing a Czechoslovak postage stamp with the illustratons of Jindřich Vlček and Bohumil Heinz. On the site of the battle a few memorials to the fallen soldiers were erected.

• Czechoslovak Legion in Italy

• Kulka, Erich (1989). "The Jews in Czechoslovakia between 1918 and 1968". In Stone, Norman; Strouhal, Eduard (eds.). Czechoslovakia: Crossroads and Crises, 1918–88. p. 50. doi:10.1007/978-1-349-10644-8_15. ISBN 978-1-349-10646-2.

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