Ejército Trigarante
By August 1821, The Army of the Three Guarantees, led by Agustin de Iturbide, had control of the majority of towns and important cities of New Spain, leaving only the royalist bastions of Mexico City and the port of Veracruz. Mexico City as capital of the Viceroyalty of New Spain was the key point for ending the 11 year Mexican War of Independence. The Army of the Three Guarantees had surrounded the periphery of the city and the royalist forces were forced into Tacuba (today Miguel Hidalgo) and the old Hacienda of Clavería.