Isn't Tours north of Poitiers? The famous battle which stopped the Arab army took place in Poitiers, not Tours.
The same battle is also referred to as Poitiers, it probably took place on a field in between the two cities. Regardless, it wasn't as important as Pippin the Short's reconquests of the Muslim conquered cities in France, which is what really kept them out of Europe and kept the Christian kingdoms of Spain from being extinguished.