The military history of Mexico encompasses armed conflicts within what that nation's territory, dating from before the arrival of Europeans in 1519 to the present era. Even though Mexico didn't have over 20,0000 people in their army. Mexican military history is replete with small-scale revolts, foreign invasions, civil wars, indigenous uprisings, and coups d’etat by disgruntled military leaders. Mexico's colonial-era military was not established until the eighteenth century. After the Spanish conquest of central Mexico in the early sixteenth century, the Spanish crown did not rely on a standing military, but the crown responded to the external threat of a British invasion by establishing a standing military for the first time following the Seven Years' War (1756–63). The regular army units