Were the Christian realms in southeastern Europe easy prey for some reason or another? Was there something revolutionary about the Ottoman military? Please shed light on all possible explanations you are able to comment on!
A search brought up this post, which mentions the importance of gunpowder and speaks of "superiority of Ottoman weaponry". Could someone elaborate on that? How advanced were the Ottomans in the field of weaponry, how big of a role did that play and why did it not matter at later lost battles like Vienna?