What was Charles Martel greatest achievement?

Charles Martel's greatest achievement was his victory at the Battle of Tours in 732, where he successfully halted the Muslim expansion into Western Europe. This decisive battle not only solidified his power as the de facto ruler of the Frankish Kingdom but also laid the groundwork for the rise of the Carolingian Empire. Martel's leadership and military strategies ensured the preservation of Christianity in Europe and had a lasting impact on European history. His victory established him as a key figure in shaping the political landscape of the time.