 Complete the following phrase:  On 2, 3 and 4 September 1792, some three hundred volunteers and supporters of the revolution, infuriated by Verdun being captured by the Prussian enemy, and rumours that the foreign enemy were conspiring with the incarcerated prisoners in Paris, raided the Parisian prisons. Jean-Paul Marat had called for preemptive action and between 1,200 and 1,400 prisoners were murdered within 20 hours 