In 1937 the regiment was transferred to the Guardia alla Frontiera, which was tasked with manning the fortifications of the Alpine Wall.

During World War II the regiment formed two Guardia alla Frontiera artillery groupings, which participated in 1941 in the invasion of Yugoslavia.

The regiment and its groupings were disbanded by invading German forces after the announcement of the Armistice of Cassibile on 8 September 1943.

The group was assigned to the 3rd Missile Brigade "Aquileia", which consisted of the Italian Army's units with a nuclear weapons mission.

In 1992 the group was reorganized as regiment and assigned to the Artillery Command of the 4th Alpine Army Corps.

[1] This article is about the Royal Italian Army's 9th Heavy Artillery Regiment, which was a support unit assigned to an army-level command.

[1] On 13 May 1937 the Chief of Staff of the Royal Italian Army and Under-Secretary of War General Alberto Pariani ordered that the regiment should be transferred to the newly formed Guardia alla Frontiera, which was tasked with manning the fortifications of the Alpine Wall.

The reorganization of the regiment concluded on 1 May 1938 and the regiment consisted then of a command in Gorizia, the I Group in Tolmin, the II and III groups in Vipava, the mixed depot in Gorizia, the branch depot in Cividale, and the mobilization magazines in Tolmin and Vipava.

[4] At the outbreak of World War II the regiment mobilized its units and the commands of the 9th and 17th Guardia alla Frontiera artillery groupings.

[1] In January 1943 the grouping, along with most of the Italian Army in Russia, was destroyed during the Soviet Operation Little Saturn.

The grouping was still in the process of being rebuilt when it was disbanded by invading German forces after the announcement of the Armistice of Cassibile on 8 September 1943.

In August 1951 the regiment moved from Verona to Trento and there it formed the III and IV groups with M59 155mm field guns.

On 1 November 1954 the regiment formed a Light Aircraft Section with L-21B artillery observation planes.

The group was re-equipped with M115 203mm howitzers and assigned to the III Missile Brigade, which consisted of the Italian Army's units with a nuclear weapons mission.

On 8 September of the same year the group lost its autonomy and the next day entered, together with an Anti-aircraft Battery with 40/70 autocannons, the reformed 9th Heavy Field Artillery Regiment "Rovigo".

The regiment was equipped with FH-70 155mm howitzers and remained a support unit of the 4th Alpine Army Corps.