The purpose of this chapter is to discuss the impact of asymmetric warfare on the military profession within the context of the Ottoman period. These effects are categorized with strategic, structural, and behavioral dimensions. The Ottoman military had been a part of many unconventional/asymmetric conflicts during the Ottoman era. These experiences are showing clearly that classical officer training system is not providing necessary knowledge to command units under this type of atmosphere. The historical event analysis is used for the methodological purpose. First finding is that asymmetry of method, technology; morale, norms, and organization were observable during the Ottoman collapse period. Second, the reactions to the asymmetric threats were conventional at first sight. Third, the solutions were found by the officers individually not through systemic attempts and they were the results of lessons learned from personal faults. In this chapter, the Ottoman period and military was considered with the viewpoints of recent definitions of asymmetric warfare.