February 21 – Neutralist organize large events against the war in many Italian cities clashing with interventionists supported by the police.[1]
February 25 – The police start shooting at a rally held in Reggio Emilia by the socialist irredentist from Trentino, Cesare Battisti, demanding Italy join the Triple Entente against Austria, killing one protester and wounding others.[1]
March
March 4 – Italy begins negotiations with the Triple Entente. The ambassador in London hands over the Italian conditions to the British Foreign Minister Edward Grey.[1]
March 31 – In Milan, public forces repress a demonstration against the war called by socialist leader Giacinto Menotti Serrati, who was arrested along with other 235 people. At the same time a demonstration in favour of the intervention takes place under the direction of Filippo Corridoni and Benito Mussolini.[1]
April
Rome, April 11, 1915: Benito Mussolini is arrested after an interventionist rally
April 8 – Foreign Minister Sidney Sonnino sends a draft treaty in eleven articles to Austria. Among the various requests the treaty envisages the transfer to Italy of Trentino and Bolzano and the Isarco Valley and various islands along the Dalmatian coast, a shift of the Italian eastern border including Gorizia, the creation of an autonomous state of Trieste, and the waiver of all Austrian claims on Albania. In exchange, Sonnino guarantees Italian neutrality in the ongoing war. On April 16, Austria rejects the Italian demands, reiterating that it is prepared to give only part of the Trentino. Consequently, the negotiations between the two States are interrupted.[1]
May 3 – Italy officially revokes the Triple Alliance. In the following days Giovanni Giolitti and the neutralist majority of the Parliament oppose declaring war, while nationalist crowds demonstrate in public areas for entering the war.[1]
May 13 – Prime Minister Antonio Salandra offers his resignation, but Giolitti, fearful of nationalist disorder that might break into open rebellion, declines to succeed as prime minister and Salandra's resignation is not accepted.[1]
May 20 – The Chamber of Deputies passes (407 to 74) a single-article bill transferring both legislative and executive powers to the government, empowering it to do what it deemed necessary to ensure the security of the state.
July 18 – August 3 – Second Battle of the Isonzo. After the failed first attempt, the Italians launch another frontal assault against the Austro-Hungarian trench lines with more artillery, but the forces of Austria-Hungary beat back this bloody offensive, which concludes in stalemate and exhaustion of weaponry.
October 18 – November 3 – Third Battle of the Isonzo. Forces of Austria-Hungary again repulse an Italian offensive, which concludes without resulting gains.
November 10 – December 2 – Fourth Battle of the Isonzo. Both sides suffer more casualties, but the Austro-Hungarian forces repulse this Italian offensive too, and the battle ends because of exhaustion of armaments.
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