Historical military units are organized groups of soldiers that have served specific roles in various armies throughout history. These units can range from small squads to large divisions, each with unique functions, such as infantry, cavalry, or artillery. Notable examples include the Roman Legions, which were key to the expansion of the Roman Empire, and the Knights Templar, known for their role during the Crusades. Over time, military units have evolved in structure and technology, adapting to the changing nature of warfare. The British Redcoats were famous for their distinctive uniforms during the American Revolutionary War, while modern units like special forces focus on specialized missions. Each unit reflects the military strategies and cultural values of its time.