Battles of the Isonzo
When Italy entered World War I in May 1915, he commanded the Second Army during the first four Battles of the Isonzo (June 1915 – December 1915). When the Austro-Hungarian Army launched the surprise Trentino Offensive in May 1916, Frugoni was appointed commander of the newly established Fifth Army to stop their advance. In mid-June 1916, General Luigi Cadorna dismissed him.