On 5 July 1940, British aircraft carrier launched an attack on Tobruk harbor. Its Fairey Swordfish torpedo bombers sank "Zeffiro", and severely damaged "Euro". Later that month, on 20 July, during another attack on Tobruk harbour, other Swordfish from HMS "Eagle" sank with torpedoes both "Nembo" and "Ostro". On 17 September of the same year, Swordfish from attacked Benghazi harbor where "Aquilone" and "Borea" were berthed, and both were sunk. "Euro" was part of the escort of the ill-fated "Duisburg" convoy, when her commander lost the opportunity of torpedoing the cruiser due to an error of identification. On 3 July 1942, while escorting three freighters from Taranto to Benghazi along with the "Da Verrazzano", "Euro" and "Turbine" shot down two Beaufort bombers.