Saul had lost his best general, who had gone over to the enemy; he had employed his troops in hunting a possible rival through the Judæan wilds when they ought to have been guarding the frontier against the national foe, and the whole force of Israelitish religion had been turned against him. There was little cause for wonder, therefore, that the Philistine armies again marched into the Israelitish kingdom, and made their way northward along the coast into the plain of Jezreel. A battle on the slopes of Jezreel decided the fate of Israel. The Hebrew army was cut to pieces, and Saul and his sons were slain. One only survived, Esh-baal, too young or too feeble to take part in the fight. Esh-baal was carried across the Jordan by Abner and the relics of the Israelitish forces, and there proclaimed king at Mahanaim. The Philistines became undisputed masters of Israel west of the Jordan, while their tributary vassal, David, was proclaimed King of Judah at Hebron. His nephew Joab was made commander-in-chief. War soon broke out between David and Esh-baal. Esh-baal grew continually weaker, and his general Abner intrigued with David to betray him into the hands of the Jewish king. Abner, however, was slain by Joab while in the act of carrying out his treason, but Esh-baal was murdered shortly afterwards by two of his servants. David declared himself his successor, and claimed rule over all Israel. This brought him into conflict with his Philistine overlords. It was equivalent to revolt, and the Philistine army swept the lowlands of Judah. David fled from Hebron and took refuge in his old retreat. Here he organised his forces; the Philistines were defeated in battle after battle, and David not only succeeded in driving them out of Judah and Israel, but in carrying the war into their own country. The Philistine cities were conquered, and soldiers from Gath, where David had himself once served as a mercenary, were drafted into the body-guard of the Hebrew sovereign. Before the Philistine war was over, Jerusalem had fallen into David's hands. The stronghold of the Jebusites was one of the last of the Canaanitish cities to surrender to the Israelites. Its older inhabitants were allowed to live in it side by side with colonists from Judah and Benjamin. The city itself was made the capital of the kingdom. Its central position, its natural strength, and its independence of the history of any special tribe, all combined to justify the choice. Here David built his palace, and planned the erection of a temple to Yahveh.