Revolutions of 1848 in the Austrian Empire even socialist currents resisted the Empire's longstanding conservatism. The events of 1848 were the product of mounting social and political tensions after the Congress of Vienna of 1815. During the "pre-March" period, the already conservative Austrian Empire moved further away from ideas of the Age of Enlightenment, restricted freedom of the press, limited many university activities, and banned fraternities. Conflicts between debtors and creditors in agricultural production as well as over land use rights in parts of Hungary led to conflicts that occasionally erupted into violence. Conflict over organized religion was pervasive in pre-1848 Europe. Tension came both from within
Revolutions of 1848 in the Austrian Empire support Croatian forces under Jelačić. After Vienna was recaptured by imperial forces, General Windischgrätz and 70,000 troops were sent to Hungary to crush the Hungarian revolution and as they advanced the Hungarian government evacuated Pest. However the Austrian army had to retreat after heavy defeats in the Spring Campaign of the Hungarian Army from March to May 1849. Instead of pursuing the Austrian army, the Hungarians stopped to retake the Fort of Buda and prepared defenses. In June 1849 Russian and Austrian troops entered Hungary heavily outnumbering the Hungarian army. Kossuth abdicated on August 11, 1849 in favour of Artúr