[1] In December 1939, Biancheri was appointed commander of the Italian naval forces in the Aegean Sea (with seat in Rhodes), an office that he would hold for two and a half years.

[1] Biancheri immediately sailed with a force that included the destroyers Francesco Crispi and Quintino Sella, the torpedo boats Lupo and Lince and two MAS, to reconquer the island.

[1] In March 1941, Biancheri participated in the planning of the successful Raid on Souda Bay, carried out by Tenth Light Flotilla members who had been brought near Suda by the destroyers Crispi and Sella.

[3] On 1 December 1941, two Italian MAS boats engaged and forced to ran aground on the Turkish coast the Soviet icebreaker Anastas Mykoyan off Kastelorizo, while on route from the Dardanelles to Suez.

[5][6][1] Between February and June 1943 Biancheri was Inspector of destroyers and torpedo boats, and on 10 August 1943 he was given command of the 8th Naval Division (light cruisers Attilio Regolo, Giuseppe Garibaldi and Luigi di Savoia Duca degli Abruzzi), with flag on Luigi di Savoia Duca degli Abruzzi, replacing Giuseppe Fioravanzo.

[1] Bergamini's flagship, Roma, was however hit by a Fritz-x guided glide bomb and quickly sank, and the command passed on to Admiral Romeo Oliva.

[1] He presided over a commission tasked with determining which former members of the Marina Nazionale Repubblicana and Decima Flottiglia MAS of the Italian Social Republic could be released from custody, and which ones needed to stay in prison.