[1][2] During 1933 he was transferred to Rome to serve at the Ministry of War, initially attached to the Military Secretariat (in this period he supervised the preparations for the invasion of Ethiopia) and from April 1936, with the rank of colonel, as Deputy Head of Cabinet of the Minister (who at the time was Benito Mussolini himself).

At 17:30 on 8 September, after the Allies had broadcast the news of the armistice, Sorice took part in the Council of the Crown chaired by the King and attended by Badoglio, Ambrosio, Guariglia, De Courten, Sandalli, Acquarone, the head of the SIM Giacomo Carboni, Army Deputy Chief of Staff Giuseppe De Stefanis, the King's aide Paolo Puntoni and Major Luigi Marchesi, Ambrosio's adjutant who had participated in the armistice negotiations alongside Castellano.

[8][9] The next day Sorice, along with General Carboni, organized an attempt to replace the head of government Badoglio with Marshal of Italy Enrico Caviglia, who had been summoned to the capital for this purpose.

In German-occupied Rome, Sorice went into hiding and set up the Clandestine Military Front with Colonel Giuseppe Cordero Lanza di Montezemolo.

Sorice remained in Rome until its liberation in June 1944, and in September he was arrested on the orders of the Marshal of Italy Giovanni Messe for having "actively participated in the political life of fascism", but was acquitted of the charge because his effective contribution to the organization of the Resistance after the Armistice.