Final answer:
A legion in ancient Rome comprised of about 5,400 infantry and specialists, along with 120 cavalry. It was subdivided into 10 cohorts, with each cohort led by 6 centurions. The legion was self-sufficient and could operate independently.
Step-by-step explanation:
A legion in ancient Rome typically consisted of approximately 5,400 infantry and specialists, along with 120 cavalry. The legion was divided into 10 cohorts, each consisting of 480 men led by 6 centurions. Each cohort had six centuries of 80 men, personally led by a centurion.
Additionally, there were hundreds of specialists such as engineers, smiths, and cooks, making each legion self-sufficient while traveling or operating in hostile territory.