What does 1 Kings 18:40 mean?

Elijah told them, 'Grab all those prophets of Baal. Don’t let a single one get away.' So they caught them, and Elijah took them down to the Kishon Valley and killed them there. 1 Kings 18:40 - Modern Text Bible

(Elijah orders the people to seize the false prophets, making sure none escape. He executes them as a way to purge Israel of Baal worship.)