A modern police force is a 'volunteer' group of community members who maintain peace and the law within a single community.
Do we know when or why a society first decided to start policing their own? Was that group a part of the military, or a militia, or local volunteers?
Hey there, you might be interested in a similiar question asked by our own /u/vertexoflife earlier in the month.
I touch upon proto-police forces with help from /u/DonaldFDraper and /u/nilhaus also gives us great insight on the American origins of police.
You may also be interested in the tactics of the earliest 'official' police forces.