How numerical superiority failed to break the Austro-Hungarian lines in 1915
In the summer of 1915, the Italian Army launched a massive offensive with a two-to-one advantage in manpower. Yet, despite overwhelming numbers, they could not dislodge a defending force entrenched in the mountains. This was the First Battle of the Isonzo, a brutal lesson in the limits of frontal assaults.
Between 23 June and 7 July 1915, the Italian Army attempted to drive Austro-Hungarian forces away from the Soča River and the surrounding mountains. The strategic objective was to capture the vital port of Trieste. While the Italians possessed a 2:1 numeric superiority, the campaign was defined by a clash of incompatible tactics and terrain.
The Italian commander, Luigi Cadorna, relied on frontal assaults preceded by short, intense artillery barrages. This strategy struggled against the Austro-Hungarian defensive advantages. The defenders occupied high-ground positions protected by barbed wire, making them remarkably resilient to the Italian advances. The most intense combat occurred around Gorizia, where fighting devolved into street-by-street urban warfare interspersed with artillery fire.
While Italian units like the Re and Casale Brigades managed to reach the suburbs of Gorizia, they were ultimately driven back. Significant Austro-Hungarian leadership also emerged during the defense; Major General Géza Lukachich von Somorja retook Redipuglia, while Major General Novak von Arienti reclaimed Hill 383. The arrival of two reinforcement divisions for General Svetozar Boroević’s Fifth Army in early July effectively halted the Italian breakthrough.
By the end of the engagement, Italian gains were minimal. They had secured the heights over Bovec and certain western ridges of the Karst Plateau near Monfalcone, but the fundamental defensive lines remained intact. The stalemate set the stage for the Second Battle of the Isonzo, which began just weeks later on 18 July 1915.
Source: First Battle of the Isonzo
