On June 18, 1942, Gabčík (who was 30), Kubiš (29), Josef Valčík (28), Jaroslav Švarc (28), Adolf Opálka (27), Jan Hrubý (27), and Josef Bublík (22) died at the church following an extended firefight with hundreds of Nazi soldiers. Bullet holes from the battle can still be seen in the church's exterior.