war's end. Leading Nazis fled the city and the British appointed a new mayor, Johannes Petermann. However, during the allied occupation of Germany a British military governor, Colonel Geoffrey Day was placed in charge of administering the city. Relations between the occupiers and the citizens of Osnabrück were generally peaceful, though tensions existed; some minor fights broke out between British soldiers and local youths and some Osnabrückers resented the relationships that developed between the occupiers and local women. Additionally, the British took over more than seventy homes for their own use by the middle of 1946. Amidst shortages, the black market thrived and became one of the main focuses of police activity. After World War II West Germany realigned its states; Osnabrück became part of the new state of Lower Saxony in 1946. The British continued to maintain Osnabrück Garrison, a garrison near the city, which at one point was the largest British garrison in the world, housing some 4,000 troops and employing around 500 local civilians. It was the target of a PIRA attack in 1996. Due to budget cuts, the troops were withdrawn in 2008 and the property returned to the local government. After three centuries, the city finally obtained its university when the government of Lower Saxony established the University of Osnabrück in 1974. Largest foreign resident groups in Osnabrück : Main sights Town Hall St. Peter's Cathedral, founded in the 11th century. It has two façade towers, originally the same size Gerdrudenberg Monastery Marienkirche Heger Tor ("Heger Gate"), a monument to the soldiers from Osnabrück who died at the Battle of Waterloo in 1815 Bucksturm, the oldest tower in the city, and once part of the city walls. It was once used as a prison for women accused of witchcraft Ruwe Fountain" (1985), created to mark the city's 1200th birthday Gladiator 2000 (1986), a gigantic painting measuring (45 × 6 meters), by Nicu Covaci Felix Nussbaum Haus, a gallery and museum dedicated to the Jewish artist and painter Felix Nussbaum, who was murdered during the Holocaust. It was designed by the architect Daniel Libeskind Kalkriese Museum, situated on the battlefield of the Battle of the Teutoburger Wald in the Wiehen Hills, where German tribes under Arminius destroyed three Roman legions. It exhibits artefacts unearthed on the battlefield and tells the story of the battle Osnabrücker Schloss (castle/palace) 17th century Baroque construction, nowadays the main building of