II Samuel 11:18 Midrash

וַיִּשְׁלַ֖ח יוֹאָ֑ב וַיַּגֵּ֣ד לְדָוִ֔ד אֶת־כָּל־דִּבְרֵ֖י הַמִּלְחָמָֽה׃

Then Joab sent and told David all the things concerning the war;