What does 1 Samuel 14:2 mean?

Saul was sitting under a pomegranate tree at the edge of Gibeah with about six hundred men. Ahijah, the priest, was there too, wearing the priestly vest. He was a descendant of Eli, who had served at Shiloh. Nobody knew Jonathan had left. 1 Samuel 14:2 - Modern Text Bible

(Saul is waiting with his small group, accompanied by the priest, while Jonathan slips away unnoticed.)