In 1942, during World War II, the cathedral was where a last stand was made by SOE-trained Czech and Slovak agents involved in the assassination of SS-Obergruppenführer Reinhard Heydrich.
SS and Police Leader of Waffen-SS Karl Fischer von Treuenfeld commanded the Nazi forces that stormed the church on 18 June 1942.
After a fierce gun battle, two of the Czechoslovaks were killed and the rest committed suicide to avoid capture.


There is a museum in the church crypt dedicated to them as national heroes.
In 1942, during World War II, the cathedral was where a last stand was made by SOE-trained Czech and Slovak agents involved in the assassination of SS-Obergruppenführer Reinhard Heydrich. SS and Police Leader of Waffen-SS Karl Fischer von Treuenfeld commanded the Nazi forces that stormed the church on 18 June 1942. After a fierce gun battle, two of the Czechoslovaks were killed and the rest committed suicide to avoid capture.

There is a museum in the church crypt dedicated to them as national heroes.
Saints Cyril and Methodius Cathedral