Today the regiment is based in Foggia in Apulia and assigned to the Mechanized Brigade "Pinerolo".

In 1993 the group was reorganized as 21st Self-propelled Field Artillery Regiment "Trieste", which in 2001 was transferred to the Mechanized Brigade "Pinerolo".

One of the ceded batteries had participated in the First Italian War of Independence, during which it fought in the Battle of Novara in 1849.

Two of the ceded batteries had been part of the Sardinian expeditionary corps in the Crimean War and fought in Crimea in 1855-56.

The same two batteries participated in the Second Italian War of Independence, during which they fought in the Battle of Solferino in 1859.

[1][6][8] In 1895-96 the regiment provided one officer and 134 troops for the formation of a mortar battery and for other units deployed to Eritrea for the First Italo-Ethiopian War.

After the Battle of Caporetto the remnants of the regiment retreated with the Italian armies to the Piave, where the regiment fought on Monte Tomba in the Monte Grappa sector during the Second Battle of the Piave River.

During the Battle of Vittorio Veneto the regiment fought on Monte Tomba, at Monfenera and then advanced to Istrana.

In 1926 the 21st Field Artillery Regiment was assigned to the 8th Territorial Division of Piacenza and consisted of a command, one group with 100/17 mod.

15 mountain guns, which had been attached to the 19th Artillery Regiment "Gavinana", returned from the war and was disbanded.

[6] In November 1940 the division's command and the 21st Artillery Regiment "Trieste" were sent to Albania to shore up the crumbling Italian forces during the Greco-Italian War.

[1][9][10] In preparation for the division's deployment to Libya for the Western Desert campaign the regiment was reinforced in June 1941 with the IX Group with 105/28 cannons, the XXI Mixed Anti-aircraft Group with two batteries equipped with 75/27 C.K.

[6] In September 1941 the division disembarked in Libya and was immediately employed in the Siege of Tobruk.

[1][9] After the British Operation Crusader in November 1941 and German-Italian Panzer Group Africa counterattack in January 1942 towards Ain el Gazala the regiment was reorganized.

[6] In May 1942 the division took part in the Battle of Gazala and in June in the Axis offensive to capture Tobruk.

On 23 October 1942 the British Eighth Army commenced the Second Battle of El Alamein, during which most of the Trieste division was annihilated.

The division's remnants retreated with the rest of the German-Italian Panzer Army to El Agheila.

[1][2][3][6][9] On 1 October 1950 the 21st Field Artillery Regiment was reformed in Bologna and assigned to the Infantry Division "Trieste".

In preparation for the handover the Italian Army formed the Grouping "Trieste" on 15 October in Udine.

On the same day the Infantry Division "Trieste" was reformed in Bologna and the 21st Field Artillery Regiment was reorganized.

The regiment now consisted of a command, a command unit, a group with QF 25-pounder field guns, a mixed group, which fielded one battery with M114 155mm howitzers and one light anti-aircraft battery with 40/56 autocannons, and an artillery specialists section.

To avoid confusion with the support units of the Mechanized Brigade "Trieste" the group was named for the Romagna region to the South of Bologna.

[1][6][7] On 12 November 1976 the President of the Italian Republic Giovanni Leone assigned with decree 846 the flag and traditions of the 21st Artillery Regiment "Trieste" to the group.

On 28 September 1993 the group lost its autonomy and the next day entered the 21st Self-propelled Field Artillery Regiment "Trieste".