Magdeburg, the cathedral was completely looted, and its colorful windows were shot out. Twenty thousand people of Magdeburg died during the war, and at the end of the war Magdeburg had a population of only 400. Magdeburg became part of Brandenburg, and was transformed into a large fortress. In 1806 Magdeburg was given to Napoleon, and the cathedral was used for storage, and also as a horse barn and sheep pen. The occupation ended in 1814, and between 1826 and 1834 Frederick William III of Prussia financed the much-needed repairs and reconstruction of the cathedral under the leaderness from Karl Friedrich Schinkel. A new main organ IV/81 with mechanical key and stop action was built 1856 to 1861 by Adolf Reubke, 1865 a new division with 6 stops was added. The cathedral organist from 1847 to 1885 was August Gottfried Ritter. He designed the stoplist for the Reubke-Organ. The glass windows were all replaced in 1900. The 20th and 21st century Ernst Röver build a new main organ with pneumatic key and stop action, 3 manuals and 100 stops in 1906. The frequent Allied bombings of World War II completely destroyed the windows of the cathedral. During the heaviest firebombing on January 16, 1945, one bomb hit the cathedral on the west side, destroying the wall, the Röver-organ, and some other parts of the building. Fortunately, the fire brigades were able to extinguish the flames on the roof structures in time, so damage to the cathedral was only moderate. The cathedral was opened again in 1955, and a new organ with mechanical action and 37 stops from Alexander Schuke Orgelbau was installed over the "paradies door" in 1969. With the end of World War II und the establishment of the communist-led German Democratic Republic in 1949, Magdeburg fell under Soviet control and the ownership of the cathedral to the GDR. Communist leaders tried to suppress religion as a potential threat to communist doctrine, thus being active in church was a social disadvantage. The eradication of religion could not be accomplished, however, and weekly peace prayers were held in the cathedral beginning in 1983 in front of the Magdeburger Ehrenmal, a sculpture by Ernst Barlach. This led to the famous Monday demonstrations of 1989 (similar to those in Leipzig), which played a significant role in the German reunification process. The cathedral is currently undergoing a reconstruction phase that began in 1983