Historical armies were organized groups of soldiers that fought in wars and conflicts throughout history. These armies varied in size, structure, and tactics, often reflecting the culture and technology of their time. Notable examples include the Roman Legion, known for its discipline and organization, and the Mongol Horde, famous for its mobility and archery skills. Different regions developed unique military strategies and formations. For instance, the Spartan Army of ancient Greece was renowned for its rigorous training and phalanx formation, while the Ottoman Empire utilized a diverse range of troops, including the elite Janissaries. Each army played a crucial role in shaping the course of history.