 The bridge was actually being held by a unit of Prussian mercenaries which formerly had worked for the Genoese but whom Paoli had managed to employ once the Genoese no longer needed their services.Though working for Paoli, this unit opened fire on Corsican troops trying to retreat over the bridge under pressure from the French.A slaughter resulted from the crossfire, the river ran red and the rest of the Corsican army retreated in disorder.