Want this question answered?
The siege of Vienna and a victory of the King of Poland, Jan III Sobieski over Ottomans there (1683)
Constantinople was seen as a bulwark against an Islamic conquest of Europe. Its fall to the Ottomans meant that the Ottomans would soon conquer the Balkans and pose a direct threat to major Central and Eastern European States such as Russia, Poland, and the Austrian Empire.
tobacco
The battle at Tours, France led by Charlemagne (I think it was Charlemagne) prevented Islamic expansion.
The victory at the Battle of Tours prevented Islam from spreading into Europe. This preserved Christianity for many centuries.Because if the Muslims had won, western Europe might have become part of the Muslim Empire.
Emperor Napoleon Bonaparte, who ruled until his final defeat at the battle of Waterloo in 1815
Ottomans advancing across Europe
It prevented Islam from becoming a dominant religion in Northern Europe and allowed Christianity a fighting chance.
The Battle of Tours in 732 AD, where Frankish leader Charles Martel defeated the advancing Muslim forces, is credited with halting the Muslim expansion into Western Europe. This victory helped to solidify Christianity's dominance in Europe and prevented Islam from becoming the continent's major religion.
Ottomans advancing across Europe
The conquest of Constantinople itself had minimal influence in the expansion of the Ottoman Empire, which already completely surrounded the city. However, it meant that the soldiers used to subdue the Byzantines could be re-purposed for other areas of the empire. The real benefits to the Ottomans that came from the conquest of Constantinople were the riches it provided and the fact that its fall struck a strong chord with Europeans who became much more afraid of the Ottomans. It also served as a more useful imperial capital than Bursa since it was closer to the fighting in Southeastern Europe and much larger.
In Western Europe, the Frankish Victory by Charles Martel in 732 C.E. at the Battle of Tours (called by the French as the Battle of Poitiers) against the Amazigh and Arab Islamic Forces from Spain, prevented Islam from reaching western and central Europe from the southwest (Iberia).