<P> On 3 May 1915 Italy officially revoked the Triple Alliance . In the following days Giolitti and the neutralist majority of the Parliament opposed declaring war , while nationalist crowds demonstrated in public areas for it . ( The nationalist poet Gabriele D'Annunzio called this period le radiose giornate di Maggio -- `` the sunny days of May '' ) . Giolitti had the support of the majority of Italian parliament so on 13 May Salandra offered his resignation to King Victor Emmanuel III , but then Giolitti learned that the London Pact was already signed : fearful of a conflict between the Crown and the Parliament and the consequences on both internal stability and foreign relationships , Giolitti accepted the fait accompli , declined to succeed as prime minister and Salandra 's resignation was not accepted . On 23 May , Italy declared war on Austria - Hungary . This was followed by declarations of war on the Ottoman Empire ( 21 August 1915 , following an ultimatum of 3 August ) , Bulgaria ( 19 October 1915 ) and the German Empire ( 28 August 1916 ) . </P>
<P> On 3 May 1915 Italy officially revoked the Triple Alliance . In the following days Giolitti and the neutralist majority of the Parliament opposed declaring war , while nationalist crowds demonstrated in public areas for it . ( The nationalist poet Gabriele D'Annunzio called this period le radiose giornate di Maggio -- `` the sunny days of May '' ) . Giolitti had the support of the majority of Italian parliament so on 13 May Salandra offered his resignation to King Victor Emmanuel III , but then Giolitti learned that the London Pact was already signed : fearful of a conflict between the Crown and the Parliament and the consequences on both internal stability and foreign relationships , Giolitti accepted the fait accompli , declined to succeed as prime minister and Salandra 's resignation was not accepted . On 23 May , Italy declared war on Austria - Hungary . This was followed by declarations of war on the Ottoman Empire ( 21 August 1915 , following an ultimatum of 3 August ) , Bulgaria ( 19 October 1915 ) and the German Empire ( 28 August 1916 ) . </P>
when did italy enter the first world war
when did italy enter the first world war
1915
1915