The important battle that took place in 1215 between the English and the French is the Battle of Bouvines. This battle occurred on July 27, 1214, and involved a coalition led by King Philip II of France against a coalition of English forces, including King John of England, and other allies. It was significant in establishing French dominance in the 13th century and weakened John's position in England, contributing to the eventual discontent that led to the signing of the Magna Carta in 1215. The battle is often considered a pivotal moment in the ongoing power struggle between the French monarchy and English royalty.