Alexander the Great’s military successes were significantly due to his elite Companion Cavalry, known in Greek as the Hetairoi. This mounted unit functioned as shock cavalry, specializing in powerful charges designed to break enemy infantry lines. The Companions were considered the most prestigious force within the Macedonian army, playing a crucial role in Alexander’s campaigns. Their tactical deployment often decided the outcome of battles, exploiting weaknesses in opposing formations. The cavalry’s effectiveness stemmed from rigorous training, superior equipment, and the close relationship between soldiers and Alexander himself. Historians recognize the Companions as a key component of Alexander’s unprecedented military achievements and empire-building.