Following a 23 March 1944 bomb attack in the Via Rasella by Italian resistance fighters that killed 33 soldiers , Hass , Capt. Erich Priebke and fellow officers rounded up 335 Italians and the next day transported them to the Ardeatine caves at the outskirts of Rome . Hass , Priebke , and their soldiers systematically executed each captive with a shot to the back of the head . The Ardeatine massacre is one of the most notorious in the Italian history of World War II
Ardeatine massacre
Ardeatine massacre
Karl Hass