The term "fédérés" (sometimes translated to English as "federates") most commonly refers to the troops who volunteered for the French National Guard in the summer of 1792 during the French Revolution. The fédérés of 1792 effected a transformation of the Guard from a constitutional monarchist force into a republican revolutionary force.
"Fédérés" has several other closely related meanings, also discussed in this article.
The term "fédérés" derives from the Fête de la Fédération, the annual celebration during the revolutionary era, celebrated at the Champ de Mars in Paris on the anniversary of the storming of the Bastille. The Bastille fell on 14 July 1789. At the first fête de la Fédération in 1790, Talleyrand said Mass, Lafayette addressed the crowd, and King Louis XVI gave a secular sermon. The attendees, known as fédérés, came from all over France and brought the spirit of the revolution back to the provinces.
However, the term "fédérés" as used by historians today almost always refers to the volunteer troops of 1792. The third fête of 1792 was of a far more radical nature than that of 1790, and prefigured the militant insurrections later in the year.
In early May, 1792, the Girondin Minister of War Joseph Servan made the proposal to bring armed volunteers from the provinces to Paris. The citizen-soldiers were to be invited to the city for the third fête, but they were also intended to become an effective supplement to the regular army. They were to receive military training in Paris and eventually take their place at the frontlines in the French Revolutionary War.