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Battles of the Isonzo

For the Ostrogoth invasion of Italy, see Battle of Isonzo (489).

The Battles of the Isonzo (known as the Isonzo Front by historians, Slovene: soška fronta) were a series of twelve 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.

Isonzo front
Part of Italian Front (World War I)

Depiction of the Battle of Doberdò.
Date23 May 1915 – 27 October 1917
(2 years, 5 months and 4 days)
Location
Isonzo River valley
Result
  • Five Italian victories
  • Three inconclusive
  • Three Austro-Hungarian victories and final Central Powers victory[1]
Belligerents
 Kingdom of Italy  Austria-Hungary
 German Empire (from 1917)
Commanders and leaders
Luigi Cadorna
Pietro Frugoni
Settimio Piacentini
Luigi Capello
Prince Emanuele Filiberto		 Austria-Hungary Archduke Friedrich
Austria-Hungary Conrad von Hötzendorf
Austria-Hungary Arz von Straußenburg
Svetozar Borojević
Otto von Below
Units involved
2nd Army
3rd Army		 5th Army
Casualties and losses
645,000
(pre-Caporetto)		 450,000
(pre-Caporetto)
The plain at the confluence of the Soča and Vipava rivers around Gorizia is the main passage from Northern Italy to Central Europe.

Italian military plans

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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, Croats and Austrian Germans.

Italian commander Luigi Cadorna, a staunch proponent of the frontal assault who claimed the Western Front proved the ineffectiveness of machine guns,[2] initially planned breaking onto the Slovenian plateau,[clarification needed] taking Ljubljana and threatening Vienna.[citation needed] The area between the northernmost part of the Adriatic Sea and the sources of the Isonzo River thus became the scene of twelve successive battles.[citation needed].

As a result, the Austro-Hungarians were forced to move some of their forces from the Eastern Front and a war in the mountains around the Isonzo River began.[3]

Geography

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Remains of Kluže, an Austro-Hungarian fortification between Bovec and Log pod Mangrtom

The 138 kilometres (86 mi) long Soča River at the time ran entirely inside Austria-Hungary in parallel to the border with Italy, from the Vršič pass in the Julian Alps to the Adriatic Sea, widening dramatically a few kilometers north of Gorizia, thus opening a narrow corridor between Northern Italy and Central Europe, which goes through the Vipava Valley and the relatively low north-eastern edge of the Postojna Gate to Inner Carniola and Ljubljana.

Italian troops did not reach the port of Trieste, the Italian General Luigi Cadorna's initial target, until after the Armistice.[4]

Primary sector for Italian operations

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Italian soldiers during the Second Battle of the Isonzo, 1915

With the rest of the mountainous 640-kilometre (400 mi) length of the front being almost everywhere dominated by Austro-Hungarian forces, the Soča (Isonzo) was the only practical area for Italian military operations during the war. The Austro-Hungarians had fortified the mountains[citation needed] ahead of the Italians' entry into the war on 23 May 1915.

Italian Chief of Staff Luigi Cadorna judged that Italian gains (from Gorizia to Trieste) were most feasible at the coastal plain east of the lower end of the Soča (Isonzo) River. Cadorna had not expected operations in the Isonzo sector to be easy. He was well aware that the river was prone to flooding—and indeed there were record rainfalls during 1914–1918. Further, when attacking further north the Italian army was faced with something of a dilemma: in order to cross the Isonzo safely it needed to neutralise the Austro-Hungarian defenders on the mountains above, yet to neutralise these forces the Italian forces needed first to cross the river.[opinion]

 
Northeast Italy, farthest Italian advance against Austria-Hungary

Casualties

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Italian infantry leaving the trenches, 1916
 
Austrian troops crossing the Isonzo, November 1917

Despite the huge effort and resources poured into the continuing Isonzo struggle, the results were invariably disappointing and without real tactical merit, particularly given the geographical difficulties that were inherent in the campaign.

Cumulative casualties of the numerous battles of the Isonzo were enormous. Half of the entire Italian war death total — some 300,000 of 600,000 — were suffered along the Soča River. Austro-Hungarian losses, while by no means as numerous, were nevertheless high at around 200,000 (of an overall total of around 1.2 million casualties).[5]

More than 30,000 casualties were ethnic Slovenes, the majority of them being drafted into the Austro-Hungarian Army, while Slovene civilian inhabitants from the Gorizia and Gradisca region also suffered in many thousands because they were resettled in refugee camps where Slovene refugees were treated as state enemies in Italian refugee camps, where thousands died of malnutrition.[6]

Number of battles

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Austro-Hungarian supply line over the Vršič Pass. October 1917

With almost continuous combat in the area, the precise number of battles forming the Isonzo campaign is debatable.[citation needed] Some historians have assigned distinct names to a couple of the Isonzo struggles, most notably at Kobarid (Caporetto, Karfreit) in October 1917, which would otherwise form the Twelfth Battle of the Isonzo.

The fact that the battles were always named after the Isonzo River, even in Italy, was considered by some a propaganda success for Austria-Hungary: it highlighted the repeated Italian failure to breach this landmark frontier of the Empire.[7]

The Isonzo campaign comprised the following battles:

Brief summary of Isonzo battles
Battle Dates Italian casualties Austro-Hungarian casualties Outcome
First Battle of the Isonzo 23 June – 7 July 1915 15,000 10,000 Limited Italian advance
Second Battle of the Isonzo 18 July – 3 August 1915 41,800 46,600 Italian victory
Third Battle of the Isonzo 18 October – 3 November 1915 66,998 41,847 Austro-Hungarian victory
Fourth Battle of the Isonzo 10 November – 2 December 1915 49,500 32,100 Austro-Hungarian victory
Fifth Battle of the Isonzo 9–15 March 1916 1,882 1,985 Inconclusive
Sixth Battle of the Isonzo 6–17 August 1916 51,000 42,000 Italian victory
Seventh Battle of the Isonzo 14–18 September 1916 17,000 15,000 Italian victory
Eighth Battle of the Isonzo 10 October 1916 – 12 October 1916 55,000 38,000 Inconclusive
Ninth Battle of the Isonzo 31 October – 4 November 1916 39,000 33,000 Austro-Hungarian victory, Italian advance halted
Tenth Battle of the Isonzo 10 May – 8 June 1917 150,000 75,000 Limited Italian advance
Eleventh Battle of the Isonzo 18 August – 12 September 1917 158,000 115,000 Italian victory
Twelfth Battle of the Isonzo 24 October – 19 November 1917 305,000 70,000 Austro-Hungarian-German victory; end of the Isonzo Campaign
Total casualties June 1915 – November 1917 950,180 520,532 Central Powers victory, counteroffensives on the Piave river (First and Second battle)

In media

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References

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  1. ^ Palazzo, Albert (2002). Seeking Victory on the Western Front. Lincoln, NE: University of Nebraska Press. p. 111. ISBN 0803287747. Retrieved 25 September 2018.
  2. ^ Thompson 2009, p. 58.
  3. ^ A War in Words, p.147-148, Simon & Schuster, 2003
  4. ^ A War in Words, p.163, Simon & Schuster, 2003 ISBN 0-7432-4831-7
  5. ^ FirstWorldWar.Com The Battles of the Isonzo, 1915-17.
  6. ^ Petra Svoljšak, Slovenski begunci v Italiji med prvo svetovno vojno (Ljubljana 1991).
  7. ^ Isonzo 1917, Sivestri

Sources

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  • Thompson, Mark (2009). The White War: Life and Death on the Italian Front, 1915-1919. Faber & Faber. ISBN 978-0571223336.
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