Secret pact between the Triple Entente and Italy, signed in London on 26 April 1915
Secret 1915 pact that brought Italy into World War I on the Entente side in exchange for territorial promises, with unfulfilled terms fueling Italian fascism.
Key Facts
- Date signed
- 26 April 1915
- Signatories
- UK, France, Russia, and Italy
- Italy declared war on Austria-Hungary
- May 1915
- Italy declared war on Germany
- One year after Austria-Hungary declaration
- Territorial gains received
- Trentino-Alto Adige, Julian March, Dodecanese Islands
- Post-war consequence
- Nationalistic resentment; contributed to rise of Italian fascism
Location
Cause → Event → Consequence
The Triple Entente sought to weaken the Central Powers by opening a new front in the Mediterranean. Italy, nominally allied with Germany and Austria-Hungary but neutral at war's outbreak, was courted with promises of substantial territorial gains at the expense of Austria-Hungary, the Ottoman Empire, and expanded African colonies.
On 26 April 1915, the United Kingdom, France, and Russia signed a secret agreement with Italy in London. Italy pledged to enter the war on the Entente side within one month in exchange for promised territorial concessions. Italy duly declared war on Austria-Hungary in May 1915, though it delayed its declaration against Germany by approximately one year.
At the Paris Peace Conference, U.S. pressure to honor self-determination reduced Italy's territorial gains below what was promised. Italy received some territories but was denied promised colonies and parts of Asia Minor. The sense of a 'mutilated victory' stoked nationalist resentment, inspiring D'Annunzio's march on Rijeka and contributing to the conditions that gave rise to Italian fascism.
Political Outcome
Italy entered World War I on the Entente side; post-war peace settlements delivered fewer territorial gains than promised, breeding nationalist grievance in Italy.
Italy neutral; Triple Entente facing pressure on existing fronts from Central Powers
Italy joined the Entente, opening a new Austro-Italian front; post-war resentment over unfulfilled promises destabilized Italian politics