Why is battle of tours an important event?

Charles was the illegitimate son of Pepin, the powerful mayor of the palace of Austrasia and effective ruler of the Frankish kingdom. After Pepin died in 714 (with no surviving legitimate sons), Charles beat out Pepin’s three grandsons in a power struggle and became mayor of the Franks. He expanded the Frankish territory under his control and in 732 repulsed an onslaught by the Muslims.

The Battle of Tours near Poitiers, France, Frankish leader Charles Martel, a Christian, defeats a large army of Spanish Moors, halting the Muslim advance into Western Europe. Abd-ar-Rahman, the Muslim governor of Cordoba, was killed in the fighting, and the Moors retreated from Gaul, never to return in such force.