Here is my list. Its hard to pinpoint just 5. Overall I would say Kadesh, Salamis, Badr, Saratoga, and Hastings.
Kadesh 1274bc---had the Hittites won, the Holy Land wouldn't have ever been filled with Jews. All 3 great monotheistic religions trace their past back to the ancient Jewish people.
Salamis 480bc--saved the future of Western Civilization. Greek thought would have perished.
Pydna 148bc--forever made Greece a subordinate in the Mediterranean
Actium 31bc--forever made Rome an Empire and not a Republic
Teutoburg Forest 9ad--Had Rome conquered Germania and expanded its boundaries to the Elbe or the Oder, there may not have been a dark ages as the 'barbarians' would have become civilized.
Adrianople 379ad--beginning of the end for the Empire
Badr 624ad--probably the smallest great battle in terms of numbers but had Muhammed lost, he may not have been recognized as a prophet and may not have been able to unite the Arabian peninsula.
Yarmuk 636ad--The Eastern Roman Empire lost Syria for ever. Had they won at Yarmouk the Holy Land would have remained Christian.
Hastings 1054ad--brought England into the Continental fold. Before that it had been part of the Norse world. Without the Normanization of England, it never would have been the great power it was destined to become.
Manzikert 1070ad--destroyed the Byzantines in Anatolia and from then on, Asia Minor and eastern Europe would be conquered by the Turks.
Tenochtitlan 1521ad--had the Aztecs wiped the Spaniards out they could have reformed their empire using Spanish weapons and potentially made Mexico completely different than what we know today.
Saratoga 1777ad--turning point in the American revolution. The USA probably wouldn't be here had it not been for this battle
Waterloo 1815ad--doomed Napoleon and remade Europe
Stalingrad 1942ad--turning point in Russia. The USSR probably would not survived had it not been for the bungling of Paulus.
Kadesh 1274bc---had the Hittites won, the Holy Land wouldn't have ever been filled with Jews. All 3 great monotheistic religions trace their past back to the ancient Jewish people.
Salamis 480bc--saved the future of Western Civilization. Greek thought would have perished.
Pydna 148bc--forever made Greece a subordinate in the Mediterranean
Actium 31bc--forever made Rome an Empire and not a Republic
Teutoburg Forest 9ad--Had Rome conquered Germania and expanded its boundaries to the Elbe or the Oder, there may not have been a dark ages as the 'barbarians' would have become civilized.
Adrianople 379ad--beginning of the end for the Empire
Badr 624ad--probably the smallest great battle in terms of numbers but had Muhammed lost, he may not have been recognized as a prophet and may not have been able to unite the Arabian peninsula.
Yarmuk 636ad--The Eastern Roman Empire lost Syria for ever. Had they won at Yarmouk the Holy Land would have remained Christian.
Hastings 1054ad--brought England into the Continental fold. Before that it had been part of the Norse world. Without the Normanization of England, it never would have been the great power it was destined to become.
Manzikert 1070ad--destroyed the Byzantines in Anatolia and from then on, Asia Minor and eastern Europe would be conquered by the Turks.
Tenochtitlan 1521ad--had the Aztecs wiped the Spaniards out they could have reformed their empire using Spanish weapons and potentially made Mexico completely different than what we know today.
Saratoga 1777ad--turning point in the American revolution. The USA probably wouldn't be here had it not been for this battle
Waterloo 1815ad--doomed Napoleon and remade Europe
Stalingrad 1942ad--turning point in Russia. The USSR probably would not survived had it not been for the bungling of Paulus.