Task: Question Generation
Input (English): The anti-clerical feeling was widespread, and Durango supported the initial reaction against the government at Mexico. In May 1832, José Urrea, a rising officer, supported the restoration of President Pedraza. On July 20, Governor Elorriaga was reinstated, and Baca along with the legislative minority were brought back to form a new legislature, which met on September 1. Chihuahua showed no desire to imitate the revolutionary movement and Urrea prepared to invade the state. Comandante-general J.J.Calvo threatened to retaliate, and a conflict seemed imminent. The entry of General Santa Anna into Mexico brought calm, as the leaders waited for clarity.
Output (English): Who threatened to retaliate?