On October 5, 1789, several thousand women set out from the markets of Paris and walked the 20 kilometres to Versailles, and by the following evening they had brought Louis XVI, Marie Antoinette and the royal family back with them. The march began over bread. The price of the four-pound loaf had been around 14 sous in August, close to a week's wages for a labourer, and the bakers of the Faubourg Saint-Antoine had nothing left.
They were not a mob in the sense usually meant. Most were market women, fishwives and laundresses, and they had a specific grievance and specific demands: bread, the removal of the Flanders regiment brought in to guard the palace, and the king's acceptance of the August decrees abolishing feudalism. They took the cannons from the Hotel de Ville and set off in the rain, and a National Guard contingent under Lafayette followed hours behind, sent by the city rather than leading.
What happened at the palace was a negotiation and then a riot. A delegation was received and got a promise of grain. Later that night a gate was found unguarded, people got in, and in the fighting two of the king's bodyguards were killed. The queen, who had been the particular object of the crowd's anger, got out of her apartments in time.
The demand made the next morning was that the king come to Paris. The king agreed. The family left in the afternoon in a procession that took six hours and included the wagons of flour from the palace stores and the guardsmen who had been disarmed, and the National Assembly voted on October 19 to sit in Paris from then on.
Nothing was settled. Louis was still king, the assembly was still drafting a constitution, and he would try to leave the country in June 1791, which is what finished the constitutional monarchy. What the march settled was a physical fact: the court was now inside a city whose population could and would turn up in arms, and every decision afterwards was taken with that in the room.