The poet, novelist, and political activist Gabriele d'Annunzio speaking in favor of Italy's entry into the war on the side of the Entente Allies, and against 'Giolittismo' at the Costanzi Theater in Rome, May, 1915. Giovanni Giolitti was five-time Prime Minister of Italy, and opposed intervention in the Great War. Illustration by Achille Beltrame.

The great demonstrations against the 'Giolittism'; Gabriele d'Annunzio speaks to the people of Rome, in Theatro Costanzi.

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The First Battle of the Isonzo began June 23, 1915 with an attack by the Italian Second and Third armies — 460,000 men in total — against Austrians under Archduke Eugen. Through the rest of the month and through the first week of July the opponents staged a series of attacks and counter-attacks.

In the First Battle, Italy suffered 15,000 casualties. By the war's end, there would be twelve Battles of the Isonzo River.

Start Date: 1915-06-23

End Date: 1915-07-07

First Battle of the Isonzo is part of Battles of the Isonzo.