The brigade fought on the Italian front in World War I. On 20 October 1926 the brigade assumed the name of IV Infantry Brigade and received the 26th Infantry Regiment "Bergamo" from the disbanded Brigade "Bergamo". The XV Infantry Brigade was the infantry component of the 15th Territorial Division of Pola, which also included the 4th Artillery Regiment. On 25 January 1930 the division moved to Volosko and consequently changed its name to 15th Territorial Division of Volosca. On 24 March 1932 the division moved to Opatija and changed its name to 15th Territorial Division of Abbazia. In 1934 the division changed its name to 15th Infantry Division "Carnaro".
