The king and queen tried to flee France, but were caught and imprisoned. Eventually, they were publicly executed, and Robespierre's reign of terror started. Robespierre decapitated anyone and everyone who disagreed with him, and the other radicals loved him for it. The reign of terror lasted a year, and over 40,000 people were guillotined under Robespierre.
I shall conquer all of Europe, and be hailed as the Emperor of the World!
In response to Robespierre's reign of terror, the moderates created the Constitution of 1795. This constitution set up a 5-man directory and a 2-house legislature, forming a democracy. Eventually, the convention voted against Robespierre and he was guillotined, thus ending his reign of terror.
Russia wasn't even worth going after anyways.
Napoleon was an experienced general, one of the greatest military geniuses of all time, and was well received by the people. The French government was collapsing, allowing Napoleon to take control as emperor. He developed the Napoleonic Code, which embodied Enlightenment principles, and undid some reforms, such as women's rights, and gave men complete authority over their wives and children.
Napoleon annexed some areas to France, abolished the HRE, and split Prussia. He did all this and much more using forceful diplomacy, which he used to put friends and relatives on European thrones, and force alliances onto many European powers, and only Britain remained outside his empire. Many European powers tried to stop Napoleon's rise to power, as they saw him as an oppressor, but Napoleon's diplomacy kept other countries from revolting.
After being exiled to Elba, returning to France, and becoming emperor a second time and losing a key battle, the people of France exiled Napoleon to the island of St. Helena, where he spent the rest of his days living in luxury until he died.