PC:Fiume question leads to war between Italy and Yugoslavia

It very much depends when exactly this war starts, since France (and possibly members of the Little Entante) could intervene in favour of Yugoslavia, or provide some sort of support.

We should not discount Yugoslavia, it is plagued by numerous problems, with Serbians dominating, but considering that it is a single front war, on a terrain heavily favouring the defender (Dalmatia) I do think it has a fighting chance. In OTL 1941 Yugoslavia could call to arms nearly 1 million men, and even with obvious technological superiority on the side of the Italy, Yugoslavia could make a decent fight of it. Also, any conflict with Italy is going to permanently wield Croatians and Slovenians to the Yugoslav Monarchy, since Italy has already taken territories considered Croatian and Slovenian, and if Italy starts a war to take more land, I am very certain that these two nationalities will rally to the Colours, if only because they hate and fear Italians much more then Serbs.
 
It very much depends when exactly this war starts, since France (and possibly members of the Little Entante) could intervene in favour of Yugoslavia, or provide some sort of support.

We should not discount Yugoslavia, it is plagued by numerous problems, with Serbians dominating, but considering that it is a single front war, on a terrain heavily favouring the defender (Dalmatia) I do think it has a fighting chance. In OTL 1941 Yugoslavia could call to arms nearly 1 million men, and even with obvious technological superiority on the side of the Italy, Yugoslavia could make a decent fight of it. Also, any conflict with Italy is going to permanently wield Croatians and Slovenians to the Yugoslav Monarchy, since Italy has already taken territories considered Croatian and Slovenian, and if Italy starts a war to take more land, I am very certain that these two nationalities will rally to the Colours, if only because they hate and fear Italians much more then Serbs.

The problem in all that...is that Italy already control what assigned to her by the Treaty of London, is part of Dalmatia included and Fiume can be captured in hours (not only italian troops are already here as part of the occupation force but the rest of the entente force in OTL decided to not engage D'Annunzio arditi so i doubt that they will fight the italians).
Basically it can easily and quickly devolve in a stalemate were Italy simply refuse to retreat and launch air and naval raid, probably supporting Montenegrin resistance against the union with Serbia; land assault limited to raid or to occupy precise position like Trau/Tragir.

Naturally much depend on how the war started, Italy yelded to Wilson decision in OTL because she needed economic help after the Great War and frankly i doubt that the USA and the rest of the Entente will play ball to a such open act of aggression; not considering the volatile internal situation in Italy...frankly the only way that Italy can start a war with Jugoslavia is with much much more severe unrest in Split in 1920 with the Croatian killing more italians (locals and of the occupation force) and the proof of the involvement of goverment officials
 
The problem in all that...is that Italy already control what assigned to her by the Treaty of London, is part of Dalmatia included and Fiume can be captured in hours (not only italian troops are already here as part of the occupation force but the rest of the entente force in OTL decided to not engage D'Annunzio arditi so i doubt that they will fight the italians).
Basically it can easily and quickly devolve in a stalemate were Italy simply refuse to retreat and launch air and naval raid, probably supporting Montenegrin resistance against the union with Serbia; land assault limited to raid or to occupy precise position like Trau/Tragir.

Naturally much depend on how the war started, Italy yelded to Wilson decision in OTL because she needed economic help after the Great War and frankly i doubt that the USA and the rest of the Entente will play ball to a such open act of aggression; not considering the volatile internal situation in Italy...frankly the only way that Italy can start a war with Jugoslavia is with much much more severe unrest in Split in 1920 with the Croatian killing more italians (locals and of the occupation force) and the proof of the involvement of goverment officials

You do have a decent point there, but you do bring up an interesting question, if the Anti-Italian riots in Split are substantialy more violent, thus causing the Italian reaction.

However, it all very much depends on what happens if Italians decide they do want to make a fight out of it, and actually stage an armed intervention. That would force the Yugoslav goverment in Belgrade to realize that Italians could have a much larger appetite and that they are coming for quite a bit of land, something that Yug. Gvt. Really can not let go, especially since that would definitely destroy any faith that Slovenes and Croatians had in Yugoslav/Serbian monarchy, and are pushed into a war they really do not want.

On the other hand, while it seems that Italy does have a substantial advantage, situation is not really as bad as it seems for Yugoslavia. As I said in my previous post, Yugoslavia could call upon over 1 Milion Men in 1941, and that number could be acomplished here as well, or somewhat reduced, with all of the fighting occuring on the Yugoslav territory, so they should have at least some familiarity with it. In regards ti combat experience, both sides should be about equal, but in regards to the morale and motivation of the men involved, advantage is certainly on the side of the Yugoslavs, especially Croats and Slovenes from the territories in question. To these people the Italy is coming in as a vulture to pick apart their homes, not to mention that Italians are the ancient enemy, hated Venice reborn, coming to slice off and annex rightful Croat/Slovene lands. Not to mention that while relations between Serbs and the rest are not particulary friendly, they are not outright poisoned as they were IOTL 1941, where non-Serb soldiers simply stayed at home while invading armies dismembered Yugoslavia.

Considering all these things, as well as terrain, which is difficult even today to go through, it is possible that this ends up in a bloody stalemate, and drags out until one side breaks, and my money is on Italians to crack first.
 
You do have a decent point there, but you do bring up an interesting question, if the Anti-Italian riots in Split are substantialy more violent, thus causing the Italian reaction.

However, it all very much depends on what happens if Italians decide they do want to make a fight out of it, and actually stage an armed intervention. That would force the Yugoslav goverment in Belgrade to realize that Italians could have a much larger appetite and that they are coming for quite a bit of land, something that Yug. Gvt. Really can not let go, especially since that would definitely destroy any faith that Slovenes and Croatians had in Yugoslav/Serbian monarchy, and are pushed into a war they really do not want.

On the other hand, while it seems that Italy does have a substantial advantage, situation is not really as bad as it seems for Yugoslavia. As I said in my previous post, Yugoslavia could call upon over 1 Milion Men in 1941, and that number could be acomplished here as well, or somewhat reduced, with all of the fighting occuring on the Yugoslav territory, so they should have at least some familiarity with it. In regards ti combat experience, both sides should be about equal, but in regards to the morale and motivation of the men involved, advantage is certainly on the side of the Yugoslavs, especially Croats and Slovenes from the territories in question. To these people the Italy is coming in as a vulture to pick apart their homes, not to mention that Italians are the ancient enemy, hated Venice reborn, coming to slice off and annex rightful Croat/Slovene lands. Not to mention that while relations between Serbs and the rest are not particulary friendly, they are not outright poisoned as they were IOTL 1941, where non-Serb soldiers simply stayed at home while invading armies dismembered Yugoslavia.

Considering all these things, as well as terrain, which is difficult even today to go through, it is possible that this ends up in a bloody stalemate, and drags out until one side breaks, and my money is on Italians to crack first.

No, military speaking there is no contest, the Kingdom of Slovens, Serbs and Croats will lose in any direct confrontation. As Italy already control what she want they need just to hold it and any offensive will be on the Jugoslavian side...and will be bloody as they are in possession of the best line of defense in Istria
At the moment Serbia had lost almost a fourth of his pre-war population, there are bandits in Croatia and in general the economy need a total overhaul, worse the biggest port and railway hub are under italian control and the Jugoslavia had contention with all his neighbourgh so help will not really forthcoming
 
To these people the Italy is coming in as a vulture to pick apart their homes, not to mention that Italians are the ancient enemy, hated Venice reborn, coming to slice off and annex rightful Croat/Slovene lands.
Dalmatian Croats were traditionally the most faithful supporters of the Serenissima, up to the last days of the republic (unsurprisingly, the last flag of the Serenissima was lowered in Trau, and preserved under the altar of the church). Not to mention that most of them were bi-lingual, and Dalmatian Croat was heavily studded with Italian loan words.
 
As I said in my previous post, Yugoslavia could call upon over 1 Milion Men in 1941, and that number could be acomplished here as well, or somewhat reduced [...].

This is far from a given. Honestly, given that Serbia has just gone through a horrific bloodletting of both military men and civilians, after having just finished another war, and all of the new territories being pre-bled by the same war, with "greens" presenting a legitimate armed force in many areas - saying the KSCS can just call up a few hundred thousand with a snap of their fingers seems dubious at best. Even if they can, even if the greens join up with them without any issues (unlikely), they run into the second problem of mobilization: arming everyone. Unless they're sitting on mountains of captured Austro-Hungarian weapons (which may be the case, I'll admit to not knowing) I doubt they had the reserves of guns and ammunition, or even basics like uniforms and boots, to equip everyone called up in a such a way.

If they have material support from other countries, that problem could be alleviated, assuming Italy doesn't step in and meddle with arms shipments (which could lead to a massive escalation, so it's likely to be limited to 'no, go the long way' which is still an issue but less of one). But this is going to take time, while the Italian Regio Esercito is likely to not be demobilized in great numbers in the face of rising tensions around Fiume.


Caveat: This is where the full-on speculation on dubious foundation starts.

It's possible that they're able to exploit this early advantage, and push across northern KSCS, taking Zagreb and Ljubljana before larger SCS formations are able to be put in position - which of course creates the potential threat of an Italo-Hungarian joint operation against the KSCS, a toppling of the still-formative postwar order and a reignition of a larger conflict.

If Italy is able to get such early successes, I can see that being the point where other powers step in and you see a diplomatic resolution (one where I expect Italy would gain Fiume, because of the weight of their bargaining position in the northern regions of the KSCS).
 
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