Absalom had put Amasa in charge of the army to replace Joab. Amasa was the son of a man named Ithra, the Ishmaelite who lived with Abigail, the daughter of Nahash and sister of Zeruiah, Joab's mother.
“How is young Absalom? Is he all right?” the king asked. Ahimaaz answered, “It was very chaotic when your officer Joab sent me, your servant. I really don't know what was happening.”
When Abner arrived back in Hebron, Joab took him aside into the town gatehouse as if he was going to talk with him in private. But Joab stabbed him in the belly, killing him in revenge for killing Joab's brother Asahel.
The Lord will pay him back for the blood he shed, for without my father David's knowledge, he killed two good men who were better than he was. With his sword he killed Abner, son of Ner, commander of Israel's army, and Amasa, son of Jether, commander of Judah's army.
All the good people in the country are gone, there's no one who does right left anywhere. Everyone is looking to murder others; they try to trap even their own brothers.
Again the Israelites cried out to the Lord to help them, and he provided someone to rescue them, Ehud, son of Gera the Benjamite, a left-handed man. The Israelites sent him to pay the tribute to Eglon, king of Moab.