Thus adroitly deluded by David, Achish thought himself secure in undertaking a decisive war against the Israelites. Saul was sunk in melancholy, and since his quarrel with his son-in-law had lost his former energy in warfare. The strong arm which had fought for him, and the quick brain which had planned for him, were now turned against him. The bravest youths and men in Israel had placed themselves under David's command. Achish summoned all his troops, in order to inflict a decisive blow on Israel. Marching through the plain along the coast of the Mediterranean (which belonged to the Philistines since their victory over the Phœnicians), he led his army right into the valley of Jezreel. This territory, apart from political considerations, offered a better field than the mountain regions for employing the cavalry and chariots. In consequence of their treaty, Achish demanded that David should aid him in this great war against Saul, and unite his troops with the Philistine army. David's heart must indeed have been heavy when he joined the army, but he had no choice; he had sold himself to the enemies of his nation. The Philistine nobles, however, delivered him from his equivocal position. They loudly and vehemently demanded that the king should send away David and his soldiers, whose fidelity they mistrusted. The Philistine king was forced, by their almost rebellious demand, to dismiss David. After giving him the assurance of his unshaken confidence in his fidelity, he sent him back to Ziklag. This was fortunate for David, as he was thus saved from the dilemma of either becoming a traitor to his own people, or breaking faith with his ally Achish. The Philistines meanwhile went forth to the number of thousands, and encamped near the town of Shunem. Saul, who had received news of the preparations of the Philistines, and of their final expedition, called together the Israelitish troops, advanced in forced marches to meet the enemy, and encamped at first at the foot of Mount Gilboa. He then marched around the opposite heights, and, having proceeded northward, encamped at the north-west base of the mountain range near Endor.