His actions on other sections of the war appealed to Emperor Francis Joseph and on May 25, 1915 he was given command on the Isonzo front. He arrived on May 27 with part of the Third Army with him and leaving the rest to Army Group Mackensen. There Boroević became the Commander of the Fifth Army, with which he organized a defense against the Italians to break countless offensives. He finished building defenses and managing the logistics of his army by the end of May. While there, Boroević's troops contained eleven Italian attacks and he was hailed as the "Knight of Isonzo" in Austria-Hungary, while his soldiers adored him and called him "Naš Sveto!" ("Our Sveto!"). For valor in combat, he was promoted to the rank of Generaloberst on 1 May 1916. On 23 August 1917 he rose to the position of commander of the Southwestern Front, which was later renamed "Army Group Boroević." He would later fight at the Battle of Caporetto. In January 1918, he opposed Hungarian proposals to split Austria-Hungary's Army into separate Austrian and Hungarian units. He became Field Marshal on 1 February 1918 and was also awarded numerous medals, including the highest order for Austro-Hungarian soldiers, the Military Order of Maria Theresia. He led to defeat the southern prong of the last Austro-Hungarian offensive at the Battle of the Piave River. The front was maintained until end of October 1918, when the Italian army launched the decisive offensive of Vittorio Veneto and non-Austrian troops left their positions following the secessions of their nations from the dual monarchy (Czechs and Slovaks on 28 October, South Slavs on 29 October, Hungary on 31 October). After that Boroević fell back to Velden, where he sent a telegram to the Emperor offering to march on Vienna to fight the anti-Habsburg revolution in the imperial capital. It is not certain whether the Emperor has been given this message (Boroević doubted it); the offer was refused on behalf of the Emperor. After the Imperial & Royal Army had been demobilized by the Emperor on 6 November, Boroević was retired, by the I & R War Ministry in liquidation, by 1 December 1918.