Quran forbids aggression and taking over places of worship, so why did the Muslim armies invade Turkey and converted the Church of St Sophia into a Masjid?
Please Google Janisarries.
"......The Janissaries (Ottoman Turkish: يڭيچرى yeñiçeri [jeniˈtʃeɾi], meaning "new soldier") were elite infantry units that formed the Ottoman Sultan's household troops, bodyguards and the first modern standing army in Europe. The corps was most likely established during the reign of Murad I (1362–1389).
Janissaries began as elite corps made up through the devşirme* system of tribute, by which young Christian boys, notably Albanians, Bosnians, Bulgarians, Greeks and Serbs, were taken from the Balkans, converted to Islam, and incorporated into the Ottoman army. They became famed for internal cohesion cemented by strict discipline and order. Unlike typical slaves, they were paid regular salaries. Forbidden to marry or engage in trade, their complete loyalty to the Sultan was expected. By the seventeenth century, due to a dramatic increase in the size of the Ottoman standing army, the corps' initially strict recruitment policy was relaxed. Civilians bought their way into it in order to benefit from the improved socioeconomic status it conferred upon them. Consequently, the corps gradually lost its military character, undergoing a process that has been described as 'civilianization'.
* Devshirme was the Ottoman Empire practice of recruiting soldiers and bureaucrats from among the children of their Balkan Christian subjects. Ottoman soldiers would take Christian boys, ages 8 to 20, away from their parents in Eastern and Southeastern Europe and removing them to Istanbul. The boys were then force-converted to Islam with the primary objective of selecting and training the best children and teenagers for the military or civil service of the empire, notably into the Janissaries.
Christian boys during Ottoman rule were kidnapped and raised up as Muslims to be eventually incorporated into a regiment called "Janisarrees" hoping that they would be loyal to the Sultan alone. Which version of Islam allows this?