But was Judah strong enough to take their place, and set up in Southern Syria a sovereign state, around which the whole fighting material of the country might range itself with confidence? The incidents of the last war had clearly shown the disadvantages of its isolated position in regard to the bulk of the nation. The gap between Ekron and the Jordan, which separated it from Ephraim and Manasseh, had, at all costs, to be filled up, if a repetition of the manouvre which so nearly cost David his throne at Adullam were to be avoided. It is true that the Gibeonites and their allies acknowledged the sovereignty of Ephraim, and formed a sort of connecting link between the tribes, but it was impossible to rely on their fidelity so long as they were exposed to the attacks of the Jebusites in their rear: as soon therefore as David found he had nothing more to fear from the Philistines, he turned his attention to Jerusalem.* This city stood on a dry and sterile limestone spur, separated on three sides from the surrounding hills by two valleys of unequal length. That of the Kedron, on the east, begins as a simple depression, but gradually becomes deeper and narrower as it extends towards the south. About a mile and a half from its commencement it is nothing more than a deep gorge, shut in by precipitous rocks, which for some days after the winter rains is turned into the bed of a torrent.** * The name Jerusalem occurs under the form Ursalîmmu, or Urusalîm, in the Tel el-Amarna tablets. Sion was the name of the citadel preserved by the Israelites after the capture of the place, and applied by them to the part of the city which contained the royal palace, and subsequently to the town itself. ** The Kedron is called a nalial (2 Sam. xv. 23; 1 Kings ii. 37; Jer. xxxi. 40), i.e. a torrent which runs dry during the summer; in winter it was termed a brook. Excavations show that the fall diminishes at the foot of the ancient walls, and that the bottom of the valley has risen nearly twelve yards.