In 2008, the Italian War History Museum in Rovereto created the temporary exhibition "In Spain for the Fascist Idea. Trentino Legionaries in the Spanish Civil War," displaying images, memorabilia, and documents related to the experience of Trentino soldiers who participated in the Spanish Civil War as part of the Corpo Truppe Volontarie. The exhibition, resulting from a thesis promoted by the University of Trento, also led to the publication of a photographic catalog.

The exhibition opened with a large photograph depicting five Italian soldiers posing in front of a rock on which were inscribed the symbols of the supporting powers of the Spanish nationalist faction: Fascist Italy and Nazi Germany. Exceptionally, the inscription also included the names of the legionaries and their origins.

Through the conducted research, we know that the soldiers portrayed in the photo were part of the Cesare Battisti Company, a unit composed exclusively of Trentino soldiers. The date of August 1, 1937, helps place the soldiers in the region of Las Merindades, province of Burgos, a territory occupied in preparation for the offensive on Santander.

In 2022, some passionate Spanish researchers rediscovered the rock with the engravings depicted in the archival image, and news of this particular discovery was shared in both Spanish and Italian media.

The engraving is part of a significant group of inscriptions left by the Italians stationed in that Northern Spanish territory. A census and enhancement project led by archaeologist Amalia Pérez-Juez Gil's team was initiated in 2023. The work is subsidized by the Secretary of State for Democratic Memory as part of grants for collecting, preserving, studying, and disseminating the heritage of the Civil War and/or Dictatorship. To date, more than 50 inscriptions have been discovered, geolocated, and are under study.

The War Museum also collaborates in the research to deepen the understanding of the signs left by some of the approximately 600 Trentino soldiers who participated in the Spanish Civil War between 1936 and 1939.