Christians, 600 Catholics, 76 Jews, and about 100 Romani. In 1777, the population of Zemun numbered 1,130 houses with 6,800 residents, half of which were ethnic Serbs, while another half of population was composed of Catholics, Jews, Armenians and Muslims. Among Catholic population, the largest ethnic group were Germans. From this period originates the increased settlement of Germans and Hungarians in the Zemun. While during the Ottoman period Zemun was a typical oriental-type small town, with khans, mosques and large number of Turkish population, after becoming part of Austria, the town prospered as an important road intersection and a border city, which boosted trade. The town had a port on the Danube and was a major fishing center. It is recorded that in 1793, a heavy Beluga sturgeon was caught. In 1816 it was greatly expanded by mass resettlement of Germans and Serbs in the new town suburbs of Franzenstal and Gornja Varoš, respectively. In the 19th century, Zemun reached 7,089 residents and 1,310 houses. Zemun also became important in Serbian history as the refuge for Karađorđe in 1813 as well as many other people from the nearby Belgrade and the rest of Karađorđe's Serbia which fell to the Ottoman rule. During the Revolution of 1848–1849, Zemun was one of the de facto capitals of Serbian Vojvodina, a Serbian autonomous region within Habsburg Empire, but in 1849, it was returned under the administration of the Military Frontier. With the abolishment of the Military Frontier in 1881, Zemun and the rest of the eastern Srem was included into Syrmia County of Kingdom of Croatia-Slavonia, part of Austria-Hungary. The first railway line that connected it to the west was built in 1883, and the first railway bridge over the Sava followed shortly thereafter in 1884. The Zemun Fortress was the site of the first shots fired during World War I, when the Austro-Hungarian Army shelled the Serbian capital of Belgrade. Serbian engineers responded by demolishing the Old Railway Bridge over the Sava River, damaging an Austro-Hungarian Navy patrol boat below. During the Serbian campaign at the beginning of World War I, Zemun was briefly occupied by the Royal Serbian Army, and many South Slavs living in the city fled to Serbia. The Austro-Hungarian Balkan Army under Oskar Potiorek quickly retook the city and hanged suspected collaborators. The city returned to Serbian control on November 5, 1918. The town became part of the