Between the World Wars, the world powers started a rush to gain the supremacy on the seas. In 1926, France started to produce the Le Fantasque class of destroyers, which were superior in displacement and firepower to other destroyers of that period. To counter the French menace, the Regia Marina decided to produce a new class of cruiser that would be of intermediate size between the new French destroyer class and cruisers. The Italian ships equated to the British Leander-class cruisers.
Meant to hunt down and overwhelm the big French destroyers, the emphasis on firepower and speed resulted in these ships being virtually unprotected against gunfire and underwater threats; this was a major factor in all four ships being sunk by torpedoes.
Cernuschi, Enrico (2022). "Esploratori of the Regia Marina, 1906—1939". In Jordan, John (ed.). Warship 2022. Oxford: Osprey Publishing. pp. 147–160. ISBN978-1-4728-4781-2.