In 1942, during World War II, the cathedral was the scene of the last stand of a number of Czech and Slovak patriots who had assassinated Reinhard Heydrich, the Nazi SS Obergruppenfuhrer and General of Police. After a fierce gun battle, they reportedly committed suicide to avoid capture. Presently there is a museum in the church dedicated to them as national heroes. Karl Fischer von Treuenfeld was in command of the troops that stormed the church on 18 June 1942.
Buildings - Religious, Safari Submissions
Links: en.wikipedia.org, virtualglobetrotting.com