Arditi was the name adopted by Royal Italian Army elite special force of World War I. The name derives from the Italian verb ardire ("to dare") and translates as "The Daring Ones".
Reparti d'assalto (Assault Units) were formed in the summer of 1917 by Colonel Bassi, and were assigned the tactical role of shock troops, breaching enemy defenses in order to prepare the way for a broad infantry advance. The Arditi were not units within infantry divisions, but were considered a separate combat arm.
The Reparti d'assalto were successful in bringing in a degree of movement to what had previously been a war of entrenched positions. Their exploits on the battlefield were exemplary and they gained an illustrious place in Italian military history. They were demobilized by 1920.
The name Arditi was later used in 1919–20 by the Italian occupiers of Fiume who were led by Gabriele D'Annunzio, most of whom had been members of the Royal Italian Army. Their use of a uniform with black shirts and black fez was later taken up by Benito Mussolini's paramilitary forces, the Blackshirts.
From 1 October 1975 the flag of X Arditi Regiment (formed in 1942 in imitation of the IX Assault unit of the First World War) was adopted by the 9º Reggimento d'Assalto Paracadutisti Col Moschin (9th Parachute Assault Regiment Col Moschin). To this day operatives of Col Moschin and Italian commando frogmen are known as "Arditi Incursori" and are viewed as the heirs of the Arditi of World War I.
The ardito concept can be traced back to 1914 when every regiment of the Royal Army was ordered to create a group of explorers trained to act behind enemy lines. The first Arditi units were formed and trained in Sdricca di Manzano, in the province of Udine, where the event is still celebrated on the last Sunday in July.