Conspiracy of Queretaro.

Queretaro located at 20°35′N 100°23′W

The discovery of the Queretaro Conspiracy happened on September 1810, three months from the set date of the revolution. Authorities arrested some members like Manuel Iturriaga and Epigmenio Gonzales. On the 13th, they arrested Joesefa Ortiz de Dominguez. But before being caught, Dominguez sent a warning to Aldama and Allende about the government crackdown. The two then proceeded to the town of Dolores and warned Fr. Hidalgo about the danger of imprisonment and mostly likely, death.

Source

View attached image.