At the opening of the Convention the Montagnard group comprised men of very diverse shades of opinion, and such cohesion as it subsequently acquired was due rather to the opposition of its leaders to the Girondist leaders than to any fundamental hostility between the two groups.
It was nevertheless proscribed in the next year at the instance of the Montagnard deputy Albitte, for an anti-anarchical hemistich (Des lois et non du sang!); Fenelon (1793) was suspended after a few representations; and in 1794 his Timoleon, set to Etienne Mehul's music, was also proscribed.
During their struggle with the Girondists, the Montagnards gained the upper hand in the Jacobin Club, and for a time Jacobin and Montagnard were synonymous terms. The Mountain was successively under the sway of such men as Marat, Danton, and Robespierre, and the group finally disappeared after Robespierre's death and the successes of the French arms.