It is important to remember certain things. One is that Islam has been trying to conquer the western world since the first century. The goal being an entire world dominated by the Caliphate. This was the primary reason why Christian Europe launched the Crusades. The second is that notable Christian European warriors have periodically stopped the invasions and bought the west more time. Make no mistake, without these men and their exploits, western europe, and by extension all of the Americas, would have been under Muslim control and western culture would have never existed.
One of these men was Charles Martel -
At the Battle of Tours Martel defeated a large army of Moors, halting the Muslim invasion into Western Europe. Abd-ar-Rahman, the Muslim governor of Cordoba, was killed in the fighting, and the Moors retreated from what is now modern day France.
For seven days, the two armies faced off with minor skirmishes. The Muslims waited for their full strength to arrive. 'Abd-al-Raḥmân, despite being a proven commander, had been outmaneuvered; he had allowed Charles to concentrate his forces and pick the field of battle. Furthermore, it was impossible for him to judge the size of Martel's army, since Charles had used the trees and forest to screen his true numbers.
Although outnumbered, Martel's infantry were seasoned and battle-hardened, most of them had fought with him for years, some as far back as 717.
'Abd-al-Raḥmân trusted the tactical superiority of his cavalry and had them charge repeatedly. In one of the few instances where medieval infantry stood up against cavalry charges, the disciplined Frankish soldiers withstood the assaults. The well-trained Frank soldiers accomplished what was not thought possible at that time: infantry withstanding a heavy cavalry charge.
The Mozarabic Chronicle of 754 says:
And in the shock of battle the men of the North seemed like a sea that cannot be moved. Firmly they stood, one close to another, forming as it were a bulwark of ice; and with great blows of their swords they hewed down the Arabs. Drawn up in a band around their chief, the people of the Austrasians carried all before them. Their tireless hands drove their swords down to the breasts of the foe.
Martel's victory stopped the Muslim Invasion into western Europe and arguably set the stage for the liberation of Spain.