Why the small mexican untied army was able to win the battle against a large army

Battle of Puebla took place on the 5th of February 1862 between Mexico and the invading French forces.

The French General Lorencez actually believed that the local population of Puebla was against the Mexican government and if the French showed up with a powerful army, they would be able to receive support from the people of Puebla.

The French, though technologically superior, quickly run out of ammunition and could not garner any support among the locals.

The French were able to regroup in the coming months and launch a successful second invasion, but this battle has remained a national holiday and a day of pride for Mexicans.