Premise: The following year, acting with what Prime Minister Antonio Salandra acknowledged to be  sacro egoismo,  Italy signed a secret treaty to enter the war on the side of Britain, France, and Russia in exchange for the post-war annexation of Austrian-held Trento, South Tyrol (now Alto Adige), and Trieste.

Hypothesis: Britain, France, Russia, and Italy fought together in a war.
Relation: entailment