[1] When the Kingdom of Italy entered World War I, on 24 May 1915, he took part in the defense of Grado, and later served on the destroyer Indomito and then, as executive officer, on the flotilla leader Cesare Rossarol.

After promotion to captain in 1931, he was assigned to the Army War School in Turin, after which he commanded heavy cruisers Pola and Zara, while also fulfilling the task Chief of Staff of the 1st Fleet.

[1][3][4][5] Di Giamberardino wrote over a dozen books about naval history and strategy over the course of his career; in 1933 he received the 2nd class silver medal for two of his works, Il fascismo e gli ideali di Roma, which through an examination of Roman history studied the maritime vocation of Italy, and Politica marittima, an analytical examination of Italian naval policy.

His vision, marked by realism, did not hide the impossibility of defending the most important trade lines of the Mediterranean Sea where the likely enemy, Great Britain, was in control of the key positions, advising a defensive policy as the only possible course of action.

[11][12] During the 1930s Di Giamberardino was also among the opponents of the construction of aircraft carriers, which he considered as too vulnerable, along with Angelo Iachino and Luigi Sansonetti, whereas Bernotti, Fioravanzo and Francesco Maugeri supported the idea.