Why are junior soldiers called "privates"

Where did the term “private” come from in ranking a junior enlisted soldier?

(or for that matter, “corporal” or “sergeant”)


From this page.

Go to that page and click on the links for corporal and sergeant for explanations of those terms.

That would be a “private soldier”, as one who is charged with duties pertaining only to himself, with no responsibility for any other (in other words, he has no other man to command or lead).