What does 2 Kings 11:9 mean?

The commanders did exactly what Jehoiada told them. Each brought his men—those coming on duty and those going off duty—on the Sabbath, and they all reported to Jehoiada the priest. 2 Kings 11:9 - Modern Text Bible

(The guards follow Jehoiada's instructions precisely, showing their loyalty and the seriousness of the plan.)