During World War I, the 4th Army was positioned between the Asiago plateau and the Carnic Alps.
During the Caporetto disaster, it had to withdraw to the Mount Grappa massif, where it won the defensive battle of Mount Grappa.
Its commanders were : At the beginning of World War II, the 4th Army was one of three armies that made up Army Group West commanded by Prince General Umberto di Savoia.
After the Franco-Italian Armistice, the 4th Army occupied a small zone of France, which was enlarged in November 1942, when during Case Anton the Italians occupied all of southeastern France and Corsica.
After the Armistice of Cassibile in September 1943, the 4th Army surrendered to the Germans.