Thanks to the career of Alexander the Great, Macedonia has become synonymous with military innovation and territorial conquest. The question of how he was able to accomplish this has been explored in detail by generations of scholars, and an exhaustive list of works explore this topic, by scholars including Heckel, Hatzopoulo, Karunanithy, Sekunda, Heckel, Bosworth, Engels and Fuller. This chapter outlines key elements of Alexander’s army and tactics to develop a discussion about some of the fundamental shifts he brought onto the battlefield and how they reflect aspects of Macedonian identity.