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

During the same year the Infantry Division "Granatieri di Sardegna" was disbanded and the battalion was transferred to the Central Military Region.

[6][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.

[6] During World War II the regiment's depot in Bologna mobilized the following units:[6] On 11 June 1940, the 3rd Engineer Grouping was formed.

After the surrender of Yugoslavia, the grouping was assigned to the 2nd Army and moved to Sušak on occupation duty.

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.

On 1 May 1952, the company joined the newly formed Engineer Battalion "Granatieri di Sardegna".

On 31 October 1976, the Infantry Division "Granatieri di Sardegna" was disbanded, and the next day, on 1 November 1976, the Mechanized Brigade "Granatieri di Sardegna" was formed and received the units of the disbanded division.

On the same day, 1 November 1976, the 6th Engineer Battalion "Trasimeno" was assigned to the Central Military Region, and the Engineer Company "Granatieri di Sardegna" left the battalion and was assigned to the Mechanized Brigade "Granatieri di Sardegna".

[5][6][8] On 12 November 1976, the President of the Italian Republic Giovanni Leone assigned with decree 846 the flag and traditions of the 6th Engineer Regiment to the battalion.

On 1 December 1997, the regiment was transferred from the Central Military Region to the army's Engineer Grouping.

[10] After the August 2016 earthquake in Central Italy the regiment's companies deployed to the area to assist in the recovery efforts and to provide engineering services to the affected communities.