Joab, David’s general, returns from a raid to learn that Abner had sought out David to restore peace and unity between Israel and Judah.  Joab secretly tricks Abner into returning to Hebron and murders him to avenge the death of his brother Asahel.  David publicly mourns Abner’s death.  After learning of Abner’s death, two of his captains slay Ishbosheth, for which David…