Soon after the assembly at Hebron, which had transferred to him the royal authority over all the tribes of Israel, David set himself to win this place. First he cut off the water from the city of the Jebusites, and then Joab with the veteran band of David succeeded in climbing the wall in a sudden attack. The inhabitants were spared; at any rate a part of them must have remained, for we afterwards find Jebusites in and about Jerusalem.[284] The princes of the Philistines had begun to arm immediately upon the announcement of David's election to be king of all Israel.[285] David awaited their approach in the citadel of Zion which he had just conquered. The Philistines encamped before the city. When they were scattered in search of plunder in the valley of Rephaim David inquired of Jehovah whether he should go down against them. The answer was favourable. The Philistines were surprised and defeated. But they soon appeared a second time under the walls of Zion, and the oracle of Jehovah bade David not to go directly against them, but to turn aside under the balsam trees. If he heard the tops of the trees rustle he was to hasten on; that was the sign from God that he would go before him to smite the camp of the Philistines. So it befel. David gained a great victory and was enabled to pursue the Philistines as far as Gezer.[286] Yet the war was not decided, but still continued for a long time. Four battles took place on the borders near Gob and Gath, and many severe combats had to be fought with the Philistines. From all the traces of tradition it is clear that this war was the most stubborn and dangerous of all that David had to wage. In Israel there were stories of the brave deeds of individual heroes which were accomplished in these battles: of Abishai, the brother of Joab, who saved the king in battle, when the mighty Philistine Ishbi thought to overcome him; of Elhanan, who slew Goliath of Gath; and of the deeds of Jonathan, the nephew of David, and Sibbechai against the Philistines.[287] At length David succeeded in "wresting the bridle out of the hand of the Philistines," and "breaking their horn in pieces;"[288] he drove them back to their old borders. They had suffered such serious blows that for a long time they abstained from all further attacks, after they had carried on warfare against the Hebrews for about 70 years. Yet even David, in spite of this success, made no serious attempt to advance the borders of Israel towards the sea, or to subjugate the cities of the Philistines.