Living in Flanders I can think of many battles since Flanders has been a battlefield for centuries.
Important for our region is the Battle of the Golden Spurs (1302), a victory of an infantry army against cavalry. Without this victory there wouldn't have been a Flanders left.
The French were a classic feudal army made up of a core of 2,500 noble cavalry, including knights and squires and considered the best army at the time. They were supported by 1,000 crossbowmen, 1,000 spearmen and up to 3,500 other light infantry, totaling around 8,000. Contemporary military theory valued each knight as equal to roughly ten infantry. The Flemish (numbered about 9,000, including 400 nobles who mostly fought on foot) were primarily town militia who were equipped with such weapons as the mace 'goedendag' and a long spear known as the geldon. These would play a vital key role since they were very effective against cavalry. Another key role in the victory was the clever use of the terrain by the Flemish. The battlefield was crossed by numerous ditches and streams. These made it difficult for the French cavalry to charge the Flemish lines. It's not that easy for a horse, fully loaded with a heavy armored knight to jump over or cross a stream in the thick of battle.
The outcome of the battle—the fact that a large cavalry force, thought invincible, had been annihilated by a relatively modest but well-armed and tactically intelligent infantry—was a shock to the military leaders of Europe. It contributed to the end of the perceived supremacy of cavalry and triggered a deep re-thinking of military strategies and tactics.
source: wikipedia.