In the letter, David told Joab, “Put Uriah right in the front where the fighting is worst, and then pull back behind him so that he'll be attacked and killed.”
Who killed Abimelech, son of Jerub-Besheth? Wasn't it a woman who dropped a millstone on him from the wall, killing him there in Thebez? Why on earth did you get so close to the wall?’ Just tell him, ‘In addition, your officer Uriah the Hittite was killed.’”
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.
In addition, you know what Joab, son of Zeruiah, did to me and what he did to Abner, son of Ner, and Amasa, son of Jether, the two army commanders of Israel. He murdered them, spilling the blood of war during a time of peace. He smeared the blood of war on his belt and on his sandals.
Then Jehu wrote them a second letter, saying, “If you are on my side, and if you are going to obey what I say, bring the heads of your master's sons to me in Jezreel by this time tomorrow.” The seventy king's sons were being raised by the leading men of the city.