David brought the combined army to Jerusalem and conquered it by going in through the water shaft. He enlarged the city and strengthened the defenses, and made it his capital. Jerusalem is an important place in the plans of God.
David always consulted God before fighting a battle. The Philistines invaded Israel trying to capture David. David asked God if he should attack the Philistines, and God said yes; so he defeated them. They invaded again and God told him to attack them from the rear and he defeated them again.
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