What does 1 Samuel 13:2 mean?

Saul picked three thousand men from Israel. Two thousand stayed with him at Michmash and in the hill country of Bethel, and a thousand were with Jonathan at Gibeah in Benjamin. He sent the rest of the people home. 1 Samuel 13:2 - Modern Text Bible

(Saul organizes a standing army, keeping a select group with him and his son Jonathan, while sending the rest home.)