German-Hungarian War of 1848
Following the occupation of Vienna, Artúr Görgey did the unthinkable - with approval from Lajos Kossuth - and formally abolished the Austrian Empire. Not long afterward, did the new Democratic Hungarian Empire find itself at war with a fully unified Germany, headed by the King of Prussia, Friedrich Wilhelm IV, now Kaiser Friedrich Wilhelm I. However, minorities all across Eastern Europe rushed to aid the Hungarians in their struggle for freedom, with promises of greater rights under this new democracy.
Throughout most of December and January, the war remained deadlocked, as both sides were unable to deal a decisive blow. Just as Artúr Görgey's troops had massed within occupied Bohemia/Moravia, a declaration of war from Italy had reached Budapest. They soon found themselves with a war on two fronts, and had to adjust accordingly.
The joint German-Polish army headed by Moltke the Elder and Ludwik Mierosławski finally made its push into Prague by late January, and by the time they reached Vienna, had joined forces with the remnants of Prince Alfred's Austrian army. This massed army finally crossed the Austro-Hungarian border on February 1st, the same time Emmanuele II's Italian force had pushed its way into northern Croatia.
With the two giant armies threatening to clash on February 2nd, cooler heads managed to prevail when the Hungarian embassy in Berlin finally offered terms of a truce to Chancellor Bismarck later that night. The Alliance agreed, and on the 3rd, peace had been settled between the two giants of Central Europe.