Who are the Texas Rangers and what was their purpose

Who were they

The Texas Ranger Division, commonly called the Texas Rangers and also known as "Los Diablos Tejanos-the Texas Devils", is a U. S. statewide investigative law enforcement agency with statewide jurisdiction in Texas, based in the capital city of Austin.

Purpose

Stephen F. Austin, known as the Father of Texas, employed ten men to act as rangers to protect 600 to 700 newly settled families who arrived in Texas following the Mexican War of Independence.