The brigade was the infantry component of the 13th Territorial Division of Udine, which also included the 15th Artillery Regiment.

On 10 June 1940, the day Italy entered World War II, the Re was deployed along the border with Yugoslavia in the Cerkno – Idrija – Črni Vrh – Most na Soči area.

From 6–10 April 1941 the division defeated heavy resistance at Ravnik pri Hotedršici and then captured Ledine and Pečnik.

Increasingly intensive battles with Yugoslav partisans were fought in November–December 1941 at Štirovača forest, Divoselo, and Žuta Lokva.

Between 23 and 28 March 1942 the division tried to break through partisan lines to relieve the besieged garrisons in Titova Korenica, Udbina and Donji Lapac.

In September 1942 further fighting happened in Saborsko near Lička Jesenica, and in Plaški, Dabar, Lešće (near Otočac).

In February–March 1943 the focus of the fighting shifted to Jelovi vrh in Lika-Senj County and to Pavlovačka Draga in Bosnia and Herzegovina.

[1] Attached from 16 February 1941:[2] The division's commanding officers were:[1][2] The names of three men attached to the division can be found in the Central Registry of War Criminals and Security Suspects (CROWCASS) set up by the Anglo-American Supreme Headquarters Allied Expeditionary Force in 1945.

The names can be found at: Central Registry of War Criminals and Security Suspects from the Kingdom of Italy.