TL help

Those of you who have been following my recent TL A King's Choice will know that after a less decisive WWI, A-H survives, then collapses pretty thoroughly in the 20s. Because of the mess going on, Serbia is heavily coverting Bosnia, Hungary (under Horthay) is crushing nationalists and seeking to regain lost lands in Croatia, and Bosnia facing Civil War as the Croats (recently granted Autonomy) and Bosniaks face off against the Serbs who wish to join Serbia. After a while, we have this situation:

Serbia supported by Romania declares war on Bosnia (gaurenteed by Bulgaria, Albania and Greece). Later Hungary jumps on Croatia and will send 'peacekeeping' troops into northern Bosnia (and eventually annex a small area).

The question I'd like to ask is this: taking into account the map below, do the front movements on the second map look alright? Note also that TTLs version of the League of Nations does have an army, but will basically spend the entire war defending Sarajevo and Ruthenia. I'm also planning for Serbia/Romania to lose.

1924.png
 
On a related note, is this plausible for Hungarian history

Horthay does well in crushing the seperatists and annexes Slavonia in the 3rd Balkan War. However, soon afterwards (late 20s) he is assassinated and in the chaos, the communists take over and end up having to reform the state to a federal republic dominated by the Hungarians. Magyarisation of minorities ensues.
 
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