The Ninth Battle of the Isonzo was an Italian offensive against Austria-Hungary in the course World War I. Including a triumvirate of battles launched after the Italians' successful seizure of Gorizia in August 1916 to extend their bridgehead to the left of the town, it ended in further failure for the Italian Chief of Staff Luigi Cadorna.
The battle started with an attack on Vrtojba and the northern and central areas of the Karst Plateau. With the ninth battle fought from 1–4 November 1916 the combined casualty total from the three linked battles proved sufficiently heavy to ensure that each attack was of short duration (each less than a week). The Italians suffered 75,000 casualties and the Austro-Hungarians 63,000.
As always along the Soča (Isonzo), the Austro-Hungarian Army's command of the mountainous terrain provided a formidable natural barrier to the Italians' attempts to achieve a breakthrough. Cadorna had intended to ensure such a breakthrough in the wake of the capture of Gorizia during the Sixth Battle of the Isonzo, but instead the war of attrition gathered pace.
Neither side could particularly afford the casualties suffered but the Austro-Hungarians in particular were finding their defensive lines increasingly stretched. Realising this they continued to call upon their German ally to provide military assistance within the sector. When the Germans finally assented (sensing the potential collapse of the Austro-Hungarian position) and constructed a combined force in time for the Twelfth Battle of Isonzo, the results were dramatic.
However, with the ninth battle called off in failure on 4 November 1916 and the Italians undeniably weakened by continual offensive operations throughout the year - 1916 had seen five Isonzo operations on top of four undertaken the year before - a lengthy break was taken for the winter.
Operations renewed afresh with the Tenth Battle of the Isonzo on 12 May 1917.
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The Battles of the Isonzo (known as the Isonzo Front by historians, soška fronta) were a series of 12 battles between the Austro-Hungarian and Italian armies in World War I mostly on the territory of present-day Slovenia, and the remainder in Italy along the Isonzo River on the eastern sector of the Italian Front between June 1915 and November 1917. In April 1915, in the secret Treaty of London, Italy was promised by the Allies some of the territories of Austro-Hungarian Empire which were mainly inhabited by ethnic Slovenes and Austrian Germans.
The Fifth Battle of the Isonzo was fought from March 9–15, 1916 between the armies of the Kingdom of Italy and those of Austria-Hungary. The Italians had decided to launch another offensive on the Soča (Isonzo) River. After four attempts to cross the Soča (Isonzo) river and invade Austro-Hungarian territory, Luigi Cadorna, the Italian commander-in-chief, organized a strong new offensive following the winter lull in fighting which had allowed the Italian High Command to regroup and organize 8 new divisions for the front.
The Eighth Battle of the Isonzo was fought October 10–12, 1916 between Italy and Austria-Hungary. The Eighth Battle of the Isonzo fought briefly from 10–12 October 1916, was essentially a continuation of attempts made during the Seventh Battle of the Isonzo (14–17 September 1916) to extend the bridgehead established at Gorizia during the Sixth Battle of the Isonzo in August 1916. Italian Chief of Staff Luigi Cadorna was determined to continue Italian attacks to the left of the town, a policy that continued during the following (ninth) battle - with an equal lack of success.