Charles Ellicott Commentary 2 Samuel 20:22

"Then the woman went unto all the people in her wisdom. And they cut off the head of Sheba the son of Bichri, and threw it out to Joab. And he blew the trumpet, and they were dispersed from the city, every man to his tent. And Joab returned to Jerusalem unto the king." — 2 Samuel 20:22 (ASV)

To his tent = to his home. (Compare to 2 Samuel 20:1, 2 Samuel 18:17, 1 Kings 12:16, and others.)

Benaiah. —In the four closing verses of this chapter there is again given a short summary of the chief men of David’s reign, as if to form the conclusion of this account of his life. A similar summary has already been given in 2 Samuel 8:16–18, and the changes introduced here mark a later period of the reign.

It is noticeable that Joab still remains commander-in-chief. On Benaiah and the force which he commanded, see Note on 2 Samuel 8:18. (See also 2 Samuel 23:20–23.)