There are really two types of battles that take place: those that belong to the Lord and those that belong to us.  The Lord never loses a battle, but we can easily be defeated.  As it was with the Israelites, as long as they were committed to obeying the Lord and following Him wholeheartedly, they never lost a battle.  But when they turned from Him and began caring for themselves, their victories became few.  I don’t know that this is necessarily a transferrable principle for us today, but I do know what Paul says in Romans 8:28, “And we know that in all things God works for the good of those who love him, who have been called according to his purpose.”  That is a promise we can put our trust in if we have put our trust in Christ.  God is in control of our battles, and He’s using them to shape us into the people He wants us to be.