The Frontier Militia refers to local armed groups formed in the early days of American westward expansion. These militias were composed of settlers who banded together for self-defense against threats such as Native American tribes and outlaws. They played a crucial role in maintaining order and protecting communities in remote areas. Typically organized at the community level, the Frontier Militia operated under local leadership and often received minimal support from the federal government. Members were usually volunteers who provided their own weapons and supplies. Their activities contributed to the establishment of law and order in the expanding territories of the United States.