In 1935 the regiment was assigned to the 24th Infantry Division "Gran Sasso", which participated in the Second Italo-Ethiopian War.

The division and regiment were located in Thessaly in Greece, when the Armistice of Cassibile was announced on 8 September 1943.

The ceded batteries had participated in the Third Italian War of Independence and been awarded a Bronze Medal of Military Valor for their conduct during the Battle of Custoza in 1866.

[1][3] In 1895-96 the regiment provided one officer and 90 troops for the formation of the 9th Artillery Battery, which was deployed to Eritrea for the First Italo-Ethiopian War.

In 1911-12 the regiment provided 16 officers and 363 troops to augment units deployed to Libya for the Italo-Turkish War.

During the war the regiment's depot formed the XLI Mountain Group and three siege batteries.

During the war the regiment fought in 1915 at Ronchi, and on the Karst plateau between Sagrado and Monfalcone, as well as at Doberdò.

In 1916 the regiment was again at Doberdò and Monfalcone, before being sent to fight on Mount Košnik, and during the Ninth Battle of the Isonzo to fight at Doberdò, on Nad Logem, at Nova Vas, on Mount Pečinka, and on Veliki Hribach.

After suffering losses in the retreat to the Piave river after the Battle of Caporetto in November 1917 the regiment returned to the front in summer 1918 on the Monte Zugna.

[1] In 1926 the regiment was assigned to the 24th Territorial Division of Chieti and consisted of a command, one group with 100/17 mod.

15 mountain guns, one of which had been ceded by the 13th Artillery Regiment "Granatieri di Sardegna".

[1] In Ethiopia the 18th Artillery Regiment "Gran Sasso" fought in the Christmas Offensive in 1935 and the Battle of Shire in 1936.

06 field guns for the reformed regiment, which was assigned to the 62nd Infantry Division "Marmarica".

On 1 October of the same year the 18th Artillery Regiment "Gran Sasso" ceded its II Group with 75/27 mod.

06 field guns to help reform the 45th Artillery Regiment, which was assigned to the 63rd Infantry Division "Cirene".

[1] The "Pinerolo" division remained on anti-partisan duty in Thessaly until the Armistice of Cassibile was announced on 8 September 1943.

Infante then negotiated, with mediation the allied military mission in Greece, a collaboration agreement with the Greek People's Liberation Army (ELAS).

On 1 November 1964 the II Light Anti-aircraft Group of the regiment moved to Reggio Emilia.

[1][2] On the same date the group received the flag of the 18th Artillery Regiment, and with decree 846, which was issued by the President of the Italian Republic Giovanni Leone on 12 November 1976, the group was officially assigned the traditions of the 18th Artillery Regiment.