This is a great battle cry from King David. He gives God the reins. This should be our approach when we go into our own battles.

2 Samuel 10:12

Be of good courage, and let us be strong for our people and for the cities of our God

And may the Lord do what is good in His sight.”

http://www.biblegateway.com/passage/?search=2samuel10:12&version=NKJV