15 In it he wrote, “Put Uriah out in front where the fighting is fiercest. Then withdraw from him so he will be struck down and die.”

Read 2 Samuel 11:15 Using Other Translations

And he wrote in the letter, saying, Set ye Uriah in the forefront of the hottest battle, and retire ye from him, that he may be smitten, and die.
In the letter he wrote, "Set Uriah in the forefront of the hardest fighting, and then draw back from him, that he may be struck down, and die."
The letter instructed Joab, “Station Uriah on the front lines where the battle is fiercest. Then pull back so that he will be killed.”