From Aztec warriors to a modern professional force, the evolution of the Mexican Army.

History · Published 3 October 2026 Swipe more like this →

In short: The Mexican Army has transformed from an ancient conscript system of Aztec city-states into a professional institution under the Secretariat of National Defense. Today, it serves as the largest component of Mexico's armed forces, navigating a complex history of colonial rule, revolutionary upheaval, and contemporary anti-cartel operations.

The roots of Mexican military organization trace back to the prehispanic era, where the Aztec Triple Alliance of Tenochtitlan, Texcoco, and Tlacopan maintained a rigorous training system. At age 15, all young males were required to join the armed forces, serving in units known as Xiquipilli. This tradition of state-organized defense evolved significantly during the Spanish colonial period, which relied on a mix of Peninsular regiments and local militias, including the leather-clad soldados de cuera who patrolled the frontiers.

The 19th century brought radical shifts, defined by the War of Independence and subsequent foreign interventions. Following the 1810 uprising led by Miguel Hidalgo, the military landscape was characterized by guerrilla warfare and shifting alliances, culminating in the 1821 formation of the Army of the Three Guarantees. Later, the Porfirio Diaz era (1876–1910) sought to modernize the army along Prussian lines, though it struggled with low morale among conscripts and vulnerability to revolutionary forces. By 1914, the Federal Army was disbanded, replaced by Constitutionalist forces that eventually solidified into a professional, non-political institution by the mid-20th century.

In the modern era, the army's role has shifted toward internal security. On 11 December 2006, President Felipe Calderón initiated a major shift in strategy by deploying 6,500 troops to Michoacán to combat drug cartels. This marked the beginning of an ongoing conflict that has seen the deployment of approximately 45,000 troops. As of 2024, the institution maintains an active-duty force of 261,773 servicemembers, operating under the authority of the Secretariat of National Defense and the President.

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