David's army was a collection of malcontents, social misfits, and fugitives.  With 600 men he entered into an alliance with the Philistines, which led to the defeat of Saul.  David's cosmopolitan tribe, Judah, was Gentile rather than Jewish.  80% of David's soldiers were Baalites.  David handed over seven descendants of Saul to be hanged by the Gibeonites.  The duel with Goliath was the typical case of battle that used to be resolved by the combat of only the two best men.  David set in motion a corrupt political machine; no wonder a rebellion broke out against him.  He gained control of the Philistine caravan tariffs.  He laid a heavy tribute on the Edomites, Moabites, Ammonites, and Syrians.  He ate showbread when he was hungry.  Paid Saul a dowry of one hundred Philistine foreskins for the hand of his daughter Michal.  He had many wives.  Assassinated Uriah the Hittite.  On Mount Gilboa David's actions were remembered there. 
The greatest distortion of Jewish history is related to the figure of David.  There are two different stories about how David was made king.  There are two stories about whether it was God or Satan who forced David to take a census of Israel and Judah.  The Gospel of Matthew shows Jesus as the son of David.  Joseph the father of Jesus was not a descendant of David and Solomon, but was an ancestor was adopted into the house of David.  According to Jesus the Messiah was not the son of David.  According to the Jews the Messiah would be the successor of David.