What does 1 Samuel 17:8 mean?

Goliath stood and shouted to the Israelite troops, 'Why are you lining up for battle? Am I not a Philistine, and aren't you Saul's servants? Pick one man to come down and fight me.' 1 Samuel 17:8 - Modern Text Bible

(Goliath challenges Israel to send out a single warrior, mocking their courage.)