During World War I the regiment formed battalions and companies, which operated along the Italian Front.

In November 1926, the regiment was reformed by renaming the 5th Army Corps Engineer Grouping in Trieste.

After the announcement of the Armistice of Cassibile on 8 September 1943 the regiment was disbanded by invading German forces.

On 31 December 1975, the regiment was disbanded and its flag and traditions assigned to the 5th Engineer Battalion "Bolsena".

[4][5] The regiment's anniversary falls, as for all engineer units, on 24 June 1918, the last day of the Second Battle of the Piave River.

[3] On 1 November 1895, the Royal Italian Army formed the 5th Engineer Regiment (Miners) in Rivoli.

In 1895–96, the regiment provided nine officers and 266 enlisted to augment units deployed to Italian Eritrea for the First Italo-Ethiopian War.

The regiment also provided 29 troops to augment other engineer units, which were deployed for the war.

[4][5][6] During World War I the regiment's depot in Turin formed battalions and companies, which fought in all sectors of the Italian Front.

After its formation the grouping consisted of a command, a sappers-miners battalion based in Pula, a telegraphers battalion, which included four dovecotes located in Trieste, Pula, Udine, and Gorizia, a photo-electricians company, and a depot.

In 1935-36, the regiment provided nine officers and 380 enlisted to units deployed for the Second Italo-Ethiopian War.

In the evening of 8 September 1943, the Armistice of Cassibile, which ended hostilities between the Kingdom of Italy and the Anglo-American Allies, was announced by General Dwight D. Eisenhower on Radio Algiers and by Marshal Pietro Badoglio on Italian radio.

Germany reacted by invading Italy and the 5th Engineer Regiment was disbanded soon thereafter by German forces.

[4][5][8] On 12 November 1976, the President of the Italian Republic Giovanni Leone assigned with decree 846 the flag and traditions of the 5th Engineer Regiment to the battalion.

On 1 May 1991, the 5th Engineer Battalion "Bolsena" completed its move to the South of Italy and was assigned to the Southern Military Region.

[5] On 1 December 1997, the battalion was transferred from the Northeastern Military Region to the newly formed Engineer Grouping.