This course introduces the academic field of strategic studies and security studies by referring to a few theoretical analysis and their practices in reality. This course also sketches out the ongoing debates about security, war and peace in International Relations for the better understandings of strengths and limitations of extant frameworks. The topics covered in this course include, but do not limit to, i) Basic understanding of military history and strategies, e.g. Clausewitz and Sun Tzu; ii) Theoretical approaches to International Security; iii) Traditional security challenges faced by nation-states and its evolution; iv) Alliance system and other responses to such challenges; v) Assessment of the level of threats imposed by these traditional security challenges.