the French revolution refugee Count Charles Graimberg began to preserve the palace ruins and establish a historical collection. In 1815, the Emperor of Austria, the Emperor of Russia and the King of Prussia formed the "Holy Alliance" in Heidelberg. In 1848, the German National Assembly was held there. In 1849, during the Palatinate-Baden rebellion of the 1848 Revolutions, Heidelberg was the headquarters of a revolutionary army. It was defeated by a Prussian army near Waghaeusel. The city was occupied by Prussian troops until 1850. Between 1920 and 1933, Heidelberg University became a center of notable physicians Czerny, Erb, and Krehl; and humanists Rohde, Weber, and Gandolf. Nazism and the World War II-period During the Nazi period (1933–1945), Heidelberg was a stronghold of the NSDAP/Nazi party, (the National Socialist German Workers' Party) the strongest party in the elections before 1933 (the NSDAP obtained 30% at the communal elections of 1930). The NSDAP received 45.9% of the votes in the German federal election of March 1933 (the national average was 43.9%). In 1934 and 1935 the Reichsarbeitsdienst (State Labor Service) and Heidelberg University students built the huge Thingstätte amphitheatre on the Heiligenberg north of the town, for Nazi Party and SS events. A few months later, the inauguration of the huge Ehrenfriedhof memorial cemetery completed the second and last NSDAP project in Heidelberg. This cemetery is on the southern side of the old part of town, a little south of the Königstuhl hilltop, and faces west towards France. During World War II and after, Wehrmacht soldiers were buried there. During the Kristallnacht on November 9, 1938, Nazis burned down synagogues at two locations in the city. The next day, they started the systematic deportation of Jews, sending 150 to Dachau concentration camp. On October 22, 1940, during the "Wagner Buerckel event", the Nazis deported 6000 local Jews, including 281 from Heidelberg, to Camp Gurs concentration camp in France. Within a few months, as many as 1000 of them (201 from Heidelberg) died of hunger and disease. Among the deportees from Heidelberg, the poet Alfred Mombert (1872–1942) left the concentration camp in April 1941 thanks to the Swiss poet Hans Reinhart but died shortly thereafter due to illness he contracted while held prisoner. From 1942, the deportees who had survived internment in Gurs were deported to Eastern Europe, where most of them were murdered. On March 29, 1945, German troops left the city