muskets during this period. However, some claim that the 'European' firearms the Chinese researcher tested were actually Japanese arquebuses based on fifty-year-old Portuguese models. The design of the Ottoman matchlock is substantially different from that of the European variety and it in turn influenced the matchlocks produced in both Safavid Persia and Mughal India. 15th century The Ottoman Empire by the middle of the fifteenth century had developed strategic infantry groups along with the ascension of weaponry. Early modern warfare has many important factors alongside weapons and artillery, and strategy is one of them. Developing a strong core for the sultan was key to understanding the way the Ottoman Empire could expand and take over vast territories to maintain them under their rule. One of the most important creations for their early modern warfare was a group called the Janissaries. They were considered to be an elite group of infantryman that were highly skilled and sociable. With their placement in use for the sultan, they were an unmatched military power that no European power could compete with during the fifteenth century. The Ottoman Empire was brought up in a different way from most militaristic powers, and that was from the bottom up. They were developed in peaceful upbringings. When they conquered Constantinople in 1453, they had created a transcontinental government that would see them to continue to expand militarily and politically. They used the Janissary units to advance their stronghold on the will of the people they conquered. One of their techniques was to capture boys from the territories they had defeated and forced them to become Muslim in order to control their easily molded minds. It was a similar tactic to many growing empires, because it is understood that children are easily manipulated, and in order to maintain new territories guarded by the Janissary, they needed to have an easier population to mold. The Janissaries also had other roles outside of military conflict. They were one of the main protectors of the sultan in order to prevent coups from happening, or paramilitary units from gaining control of the empire. The problem with this is that the Ottoman Empire made the Janissaries too powerful and because of their socialization, career advancement options, and recruitment procedures, the men in the units were very cohesive and respected each other more than the sultan. This would prove to be an issue later on,