September Massacres This was a wave of killings in Paris and other cities from September 2-7 1792 There was a fear that foreigners and royalists would armies would attack Paris and that the inmates of the city's prisons would be freed and join them. About 1200 prisoners were killed in total This made a profound impression abroad, where the massacres were publicized as proof of the horrors of the revolution. (0h 10min, sep 2, 1792 y