Joab commanded the entire army of Israel, Jehoiada's son Benaiah commanded the special forces and mercenaries,

But during the seventh year of her reign, Jehoiada went out and called together the rulers of hundreds, the captains, and the guards, and assembled them together inside the LORD's Temple. He made a covenant with them, making them take an oath in the LORD's Temple, and then he revealed the king's son to them.