one held in honor of German dictator Adolf Hitler's state visit to Italy. Another review, for Prince Paul of Yugoslavia, was conducted on 17 May 1939 in the Gulf of Naples. From 5 to 19 June, Trento joined the rest of the fleet in Livorno for the first celebration of Navy Day on 10 June. Another cruise in the eastern Mediterranean followed on 9 July, during which Trento stopped in Tripoli, Tobruk, Rhodes, and Leros, before returning to Taranto on the 29th of the month. From October to December, the ship underwent a major refit, which included modifications to her armament and the installation of funnel caps. World War II On 10 June 1940, Italy declared war on France and Britain, joining its ally Germany in World War II. At that time, Trento was stationed in Messina, once again the flagship of the 3rd Division. The following day, Trento and the rest of the 3rd Division joined the 6th Division for a patrol in the Strait of Sicily, where they laid a minefield. On 8 July, the 3rd Division escorted a convoy to Libya, along with the battleships of the 1st Division; the next day, the returning warships collided with a heavily protected British convoy. In the ensuing Battle of Calabria, Trento engaged British cruisers and was heavily attacked by British aircraft, though she emerged undamaged. A force of 120 Italian aircraft arrived after both fleets had disengaged, and some Italian pilots accidentally attacked Italian vessels, prompting the fleet to paint red stripes on the forecastles of each ship. Another convoy to Libya, which passed without incident, followed on 30 July, with Trento returning to Messina on 1 August. On 31 August, the 3rd Division sortied to intercept the British convoys in Operation Hats, though the Italian fleet broke off the operation without encountering the merchant ships. Trento arrived back in Taranto on 2 September. Early on the morning of 12 October, Italian destroyers and torpedo boats engaged a pair of British cruisers in the Battle of Cape Passero; one of the destroyers, , was badly damaged in the action. Trento, Trieste, and were ordered to relieve the Italian light forces at 08:00, though this was far too late to save Artigliere, which was sunk about an hour later. While on the way back, British aircraft attacked the Italian cruisers without success. On 21 October, Trento was moved to Taranto,