God regrets having made Saul the king of Israel, so he decides to make David, a beautiful boy shepherd who lives in Bethlehem, the new king. David used to play the harp beautifully to console Saul, who had been deserted by the God. David is also the brave warrior who makes the fortress of Zion fall. Then he expands upon his power using this fortress. He is the leader of a mighty army supported by God.