A pretty good guy movie from its time, capturing the visceral essence of men standing their ground - right or wrong.
Simple premise: walking north along the west coast, John Rambo is just passing thru town and wants a bite to eat ... but the local sheriff escorts the apparent drifter to beyond the city limits, not wanting "his kind" around, and subsequently applies strong-arm measures when our hero doesn't take the hint. The situation escalates into a mental & physical battle of the will.
FWIW: I watched the first 3 Rambo movies back-to-back. They shoulda stopped here.