Unfavorable foreign policy situation has led to an increase in crisis phenomena throughout the Roman military organization. The crisis that shook the Roman world in the 3rd century was purely military in nature and was caused by the inability of the Roman military machine to function effectively in the changed political conditions. How successful were the military reforms carried out by various emperors throughout the 3rd century? Was it possible to strengthen the military power of Rome during this period, or were all the efforts and colossal sacrifices in vain and only temporarily delayed the inevitable fall of the empire?..