Absalom had appointed Amasa over the army in place of Joab. Amasa was the son of Jether, an Ishmaelite who had married Abigail, the daughter of Nahash and sister of Zeruiah the mother of Joab.
When David came to Mahanaim, Shobi son of Nahash from Rabbah of the Ammonites, and Makir son of Ammiel from Lo Debar, and Barzillai the Gileadite from Rogelim
This was the allotment for the tribe of Manasseh as Joseph’s firstborn, that is, for Makir, Manasseh’s firstborn. Makir was the ancestor of the Gileadites, who had received Gilead and Bashan because the Makirites were great soldiers.