Now, to understand Ottoman rule you must go back the history books. The Christian empire(former roman empire) has plunged into teh dark ages. It is divded into many differnt segments of sectarian rule each opposing eachother. Some Christian sects hated eacother more then the Muslims. Now, the Christian empire was RULED OVER by the dominating group the Roman Catholics(this was before the martin luther movement). The region in which the Ottoman empire conquered were orthodox's(modern greek/serbo). These people were opressed under tyrannical laws imposed on the opposing sects. MAny CHRISTIANS HATED THERE CHRISTIAN LEADIN BRETHEREN. This is a Key point. While Europe was in this state of bein, the Islamic Empire has lavished into an intellecutal society of thinkin and reasonin. Muslim rule meant freedom over the nation, where Christians are allwoed to practice tehre religion in peace. Proof of this is the former living Christian Arabs in many of the arab countries who have survived centuries of Muslim rule, if Islam preaches to convert by the sword surely they would not have existed. Now, the Crusade launched on the newly formed Ottoman empire was to reclaim the bryzantine empire, the Turks fought against the crusaders. Knowingly, when wars savage at that time ideas and thoughts begin to exchange(this is how the renassance was fueled). Many people reverted to Islam, in these northern regions(serbo/bosnian/croatian region). What happens to a minority of muslims in a Christian state? They get opressed as were the many Christians splattered through out the roman empire. The Ottomans fought against the Christians in retaliation. Please, Go Study the Crusades.