The law of 22 Prairial (June 10) gave the Revolutionary Tribunal greater powers just when military successes convinced the moderates in the Convention that emergency measures were no longer necessary. In answer to a speech by Robespierre that seemed to threaten further purges, former terrorists and ultrarevolutionaries joined the Plain in a dramatic rising within the Convention on 9 Thermidor (July 27, 1794). Robespierre was placed under arrest and was summarily tried and guillotined the next morning (July 28). Robespierre's character and influence have been the subject of great controversy. However, his integrity and devoted republicanism are beyond debate.