was appointed plenipotentiary to restore order in Hungary after the conflict. He ordered the execution of The 13 Hungarian Martyrs of Arad, and Prime Minister Batthyány was executed the same day in Pest. After a series of serious Austrian defeats in 1849, the empire came close to the brink of collapse. Thus, the new young emperor Franz Joseph I had to call for Russian help under the Holy Alliance. Czar Nicholas I answered, and sent an army of 200,000 men with 80,000 auxiliary forces. Finally, the joint army of Russian and Austrian forces defeated the Hungarian forces. After the restoration of Habsburg power, Hungary was placed under martial law. Following the Hungarian Army's surrender at Világos (now Șiria, Romania) in 1849, their revolutionary banners were taken to Russia by the Tsarist troops and were kept there both under the Tsarist and Communist systems (in 1940 the Soviet Union offered the banners to the Horthy government). After the Ausgleich of 1867, the Principality of Transylvania was once again abolished. The territory then became part of Transleithania, an addition to the newly established Austro-Hungarian Empire. Romanian intellectuals issued the Blaj Pronouncement in protest. The region was the site of an important battle during World War I, which caused the replacement of the German Chief of Staff, temporarily ceased German offensives on all the other fronts and created a unified Central Powers command under the German Kaiser. Following defeat in World War I, Austria-Hungary disintegrated. Elected representatives of the ethnic Romanians from Transylvania, Banat, Crișana and Maramureș backed by the mobilization of Romanian troops, proclaimed Union with Romania on 1 December 1918. The Proclamation of Union of Alba Iulia was adopted by the Deputies of the Romanians from Transylvania and supported one month later by the vote of the Deputies of the Saxons from Transylvania. The national holiday of Romania, the Great Union Day (also called Unification Day,) occurring on December 1, celebrates this event. The holiday was established after the Romanian Revolution, and marks the unification not only of Transylvania but also of the provinces of Banat, Bessarabia and Bukovina with the Romanian Kingdom. These other provinces had all joined with the Kingdom of Romania a few months earlier. In 1920, the Treaty of Trianon established new borders and much of the proclaimed territories became part of Romania. Hungary protested against the new state borders, as they did not follow the real