The royal faction, having no army at its immediate disposal, had to release the prisoners and promise reforms – on the night of 22 October it fled from Paris. But France's signing of the Peace of Westphalia (Treaty of Münster, 24 October 1648) allowed the French army to return from the frontiers, and by January 1649 Condé had put Paris under siege. The two warring parties signed the Peace of Rueil (11 March 1649) after little blood had been shed. The Parisians, though still and always anti-cardinalist, had refused to ask for Spanish aid, as proposed by their princely and noble adherents under Armand de Bourbon, prince de Conti, and having no prospect of military success without such aid, the noble party submitted to the government and received concessions.