The Old Regime had and intense opposition, which became more violent. The common people stormed the Bastille and then, they burnt the nobles' countryside houses (The Great Fear).
After that, the National Constituent Assembly approved several measures that abolished the Old Regime laws, like the tithe. Then, they published the Declaration of the Rights of Man and of the Citizen, and the first Constitution.
When he saw he was in danger, Louis XVI fled Paris.