4. What was the significance of D-Day in the war in Europe?​

It marked the turn of the tide for control maintained by the Nazi Germany less than a year after the invasion. Nazi Germany surrendered

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).