This is a prayer for victory. It is difficult for me to put myself in David’s position where every single day he had to think about which enemy might be on his border and which troops he would have to deploy where. It was such a different world for David as he was writing these psalms than for me as I am reading them. I think it is pretty obvious that the author is David since he speaks about the harp and the lyre and how his songs will exalt the name of the Lord. He is an interesting character, a real Renaissance man who loved music and yet was a warrior.