2Sa 11:14-15
When the king saw that his plan was frustrated through Uriah’s obstinacy, he resolved upon a fresh and still greater crime. He wrote a letter to Joab, with which he sent Uriah back to the army, and the contents of which were these: “Set ye Uriah opposite to the strongest contest, and then turn away behind him, that he may be slain, and die.”
David was so sure that his orders would be executed, that he did not think it necessary to specify any particular crime of which Uriah had been guilty.