I believe that David and his 400 warriors should uplift us all. After all it was said that David was a man after God's own heart. God used David a flawed man who sinned to advance his plan. The 400 could be anyone of us.

1 Samuel 22

1 David therefore departed from there and escaped to the cave of Adullam. So when his brothers and all his father's house heard it, they went down there to him. 2 And everyone who was in distress, everyone who was in debt, and everyone who was discontented gathered to him. So he became captain over them. And there were about four hundred men with him.

Sound familiar? God's use of flawed men should be great inspiration to all us, as we too can be used to advance God's Kingdom.