ing tied his hopes of political salvation to the dubious prospects of foreign invasion. The credibility of the king was deeply undermined and the abolition of the monarchy and the establishment of a republic became an ever increasing possibility.
As European monarchies gathered against the new régime, to restore the French absolute monarchy, the Duke of Brunswick, commanding general of the Austro–Prussian Army, issued a Manifesto, in which he threatened the destruction of Paris if any harm should come to the king or his family. The foreign threat exacerbated France's political turmoil and deepened the passion and sense of urgency among the various factions and war was declared against Austria the 20 April 1792. Mob violences occurred during the insurrection of the 10 August 1792 and the following month. As a result of the spike in public violence and the political instability of the constitutional monarchy, the Republic was proclaimed on 22 September 1792.
Louis XVI (and later his wife Marie Antoinette) was convicted of treason and guillotined in 1793. Facing increasing pressures from European monarchies, internal guerrilla wars and counterrevolutions (like the War in the Vendée or the Chouannerie), the young Republic fell into the Reign of Terror. Between 1793 and 1794, 16,000 to 40,000 persons were executed. In Western France, the civil war between the Bleus (the "Blues", supporters of the Revolution) and the Blancs (the "Whites", supporters of the Monarchy) last from 1793 to 1796 and cost around 450,000 lives (200,000 Patriotes and 250,000 Vendéens). Both foreign armies and French counterrevolutionnaries were crushed and the French Republic survived. Furthermore, the French Republic extended greatly its boundaries and established "Sister Republics" in the surrounding countries. As the threat of a foreign invasion receded and that France became mostly pacified, the Thermidorian Reaction put an end to the Terror and to Robespierre's dictature
