The Shire-reeve, in contrast to a reeve (in charge of mere tenths), was responsible for both the order of the land within his banded group of a hundred families (shire) and the call of the "hue and cry".
The hue and cry made every citizen in earshot of the sheriffs call lawfully obligated to join in a posse-commitatas, or group, which banded to catch criminals
The Magna Carta was written and signed by King John in 1215 A.D., nearly 800 years ago. The sheriffs had already existed and were known under this sir title. Sheriffs had been recognized as principle participants in the drama of government, seated just under the crowns barons in hierarchy. Their duties and responsibilities mostly carried over as America was established.
The first such transition of the English Sheriff to American soil was in Virginia in 1634. Sheriffs were still appointed by the King and was an extension of royal authority and representative of the King. There is a record of a sheriff being elected by popular vote as early as 1651, but this was highly irregular for the rules of the era.
Make friends with a like minded sheriff.
And a doctor.
plan and prepare.