Urban VIII had been amassing troops in Rome throughout 1641. Mercenaries and regular troops filled the streets and Antonio Barberini was forced to institute special measures to maintain authority over the city. But the papacy needed yet more troops. The Duke of Ceri, who had been imprisoned for wounding a papal officer in a dispute over the management of the Duchy of Ceri, and Mario Frangipani, imprisoned for murdering someone on his estate, were both pardoned by the pope and given command of papal troops.