The group consisted of batteries formed in 1915, which had served in World War I on the Italian front.

The regimental anniversary falls, as for all Italian Army artillery units, on June 15, the beginning of the Second Battle of the Piave River in 1918.

On 15 November 1941 the Group "Val d'Orco" was assigned to the newly formed 6th Alpine Artillery Regiment, which in January 1942 was sent to Montenegro on occupation and anti-partisan duties.

The grouping was deployed to occupied France, where it was disbanded after the announcement of the Armistice of Cassibile on 8 September 1943.

[1][2] On 1 July 1953 the 5th Mountain Artillery Regiment was reformed in Meran and assigned to the Alpine Brigade "Orobica".

The regiment included the Mountain Artillery Group "Sondrio" with two batteries equipped with 100/17 mod.

The group was based in Schlanders and was named for the city of Sondrio at the Northern edge of the Orobic Alps.

[3] On 12 November 1976 the President of the Italian Republic Giovanni Leone issued decree 846, which granted the Mountain Artillery Group "Sondrio" a new flag.