Mexican War of Independence
Iturbide's assignment to the Oaxaca expedition coincided with a successful military coup in Spain against the monarchy of Ferdinand VII. The coup leaders, part of an expeditionary force assembled to suppress the independence movements in the Americas, had turned against the monarchy. They compelled the reluctant Ferdinand to reinstate the liberal Spanish Constitution of 1812 that created a constitutional monarchy. When news of the liberal charter reached Mexico, Iturbide perceived it both as a threat to the status quo and a catalyst to rouse the criollos to gain control of Mexico. Independence was achieved when conservative Royalist forces in the colonies chose to rise up against the liberal regime in Spain; it was an about-face compared to their previous opposition to the peasant insurgency. After an initial clash with Guerrero's forces, Iturbide assumed command of the royal army. At Iguala, he allied his formerly royalist force with Guerrero’s radical insurgents to discuss the renewed struggle for independence.
Chihuahua (state)
During the Napoleonic Occupation of Spain, Miguel Hidalgo y Costilla, a Catholic priest of progressive ideas, declared Mexican independence in the small town of Dolores, Guanajuato on September 16, 1810 with a proclamation known as the "Grito de Dolores". Hidalgo built a large support among intellectuals, liberal priests and many poor people. Hidalgo fought to protect the rights of the poor and indigenous population. He started on a march to the capital, Mexico City, but retreated back north when faced with the elite of the royal forces at the outskirts of the capital. He established a liberal government from Guadalajara, Jalisco but was soon forced to flee north by the royal forces that recaptured the city. Hidalgo attempted to reach the United States and gain American support for Mexican independence. Hidalgo reached Saltillo, Coahuila where he publicly resigned his military post and rejected a pardon offered by Viceroy Francisco Venegas in return for Hidalgo's surrender. A short time later, he and his supporters were captured by royalist Ignacio Elizondo at the Wells of Baján (Norias de Baján) on March 21, 1811 and taken to the city of Chihuahua. Hidalgo forced the Bishop of Valladolid, Manuel Abad y Queipo, to rescind the excommunication order he had circulated against him on September 24, 1810. Later, the Inquisition issued an excommunication edict on October 13, 1810 condemning Miguel Hidalgo as a seditionary, apostate, and heretic.