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It should come as a surprise that the Austrian (and later Austro-Hungarian Army) had a very horrifying win-loss record during the mid 19th century all the way until the fall of the Empire in 1918 (in fact it's only wins post-Napoleon were the First Italian War of Independence and the Second Schleswig War).
What if the Austrians suffer a worse enough defeat in the Second Italian War of Independence (an example borrowed from my timeline being Sardinia winning all of Lombardy-Venetia) What would it take for reforms to pass regarding the Austrian Army during the 1860's and who would be the one to spearhead such reforms?