used for garden allotments and by the civil police, who had a detention centre, garages, workshops and stores on the site. Nazi period (1933–1945) When the Nazis came to power in 1933, they again brought the citadel into military use. They built gun casemates, and from 1935 divisional army units, reserve army units and the district army recruitment office were based there. Also from 1935, the Nazis used parts of the citadel as a prison for the internment of their political enemies, such as communists and trade unionists. They were kept in a police detention centre originally built to accommodate up to 60 prisoners, but at its peak 241 internees were crowded into the facility. Many of the internees were sent directly from Petersberg citadel to concentration camps. Some were murdered by the Nazis at the citadel itself. The Nazis also had a military court at the citadel for dealing with people such as deserters, which could pronounce death sentences on those being tried, and sometimes these people were immediately executed at the citadel. Today there is a memorial to those mistreated by the Nazis at the site. Some war damage was sustained, including the 12th century Leonhardskirche (St Leonard's Church) which was totally destroyed in an air raid. The church had been converted into an artillery store. Post World War II At the end of World War II, Erfurt was liberated by American forces in April 1945, and handed over to the Soviet administration on 3 July 1945, as agreed at the Yalta Conference, held in February 1945. In 1944 a transit camp for displaced people had been established in the Defense Barracks, and this continued operating under the occupying Soviet administration after the war. In 1949 the Soviet Occupied Zone became the German Democratic Republic (East Germany). From 1947 Peterberg Citadel was used mainly for civil purposes, with barracks being used by the civil police. From 1956 until 1963 the East German Army (German: Nationale Volksarmee) used the citadel and its barracks, but they then moved to new facilities on the outskirts of the city. After that the main users of site were the police, for storing equipment, and a garden allotment association. The Stasi, whose prison and district headquarters were immediately below the citadel, had warehouses and workshops on the site for their motor pool until 1990. The rest of the citadel was unused and plants were