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.