During 1792 till 1794, the Legislative Assembly waged in war with Prussia and Austria, because it believed exiled French nobles were busy building alliances to mount a counter-revolution. Plus, it wanted to spread revolution across the length and breadth of Europe. Meanwhile, on the domestic side, politics went through radicalization when insurgents under the command of Jacobins, an extremist, attacked and arrested the king on August 10th 1792. Months of turmoil, terror and violence followed in Paris with street massacres, which finally led to the National Convention coming to power over the Legislative Assembly. They in turn abolished monarchy completely and established a Republic state. Finally, on 21st January 1793, King Louis XVI was sentenced to death for the crimes of high treason and numerous others. His wife too suffered the guillotine precisely nine months later.
Following the execution, France engaged in wars with many European powers and the French Revolution went through its bloodiest phase. Internally, within the country Jacobin seized control from Girondins of the National Convention, enforcing radical rule for over 10 months. In this time Christianity was eradicated, a new calendar was issued and anyone slightly opposed to the revolution was sent to the guillotine. Thousands were executed under the eyes of Robespierre until July 28th 1794 when he too was sentenced to the guillotine. His execution brought the reign of terror of over 10 months to a halt. The local folks overthrew this extremist government and a moderate phase began.