When the most pressing danger from the Philistines was over, David turned his arms to the south and east, against the Amalekites, the Moabites, and Ammonites, who had once caused so much misery and disaster to Israel. Against the Amalekites Saul had already accomplished the main task (p. 127). David smote them with such effect that the name of the Amalekites is hardly once mentioned afterwards; the remainder of the race seem to have been amalgamated with the Edomites.[289] David had at a former time entered into connection with the king of Moab; when he fled from Saul he placed his parents under his protection. The cause of the rupture is unknown; we only know that David utterly overthrew the Moabites and caused two-thirds of the prisoners to be put to death. It is said that they were compelled to lie down; they were then divided by a measuring cord into three parts, of which two were slain by iron threshing-carts being drawn over them, and only a third part were spared.[290] Nahash, the king of Ammon, with whom David had also previously been in relations (p. 136), was succeeded by his son Hanon. This prince insulted David's envoys, he caused their beards to be shaved off, and their garments to be cut away as high as the middle. David sent Joab with the levy of the people against the Ammonites to avenge the insult. Hanon called on the king of Zobah--Saul had already had to fight against Zobah--and the rulers of Beth-Rehob, Maacah, and Tob in Syria for assistance. Hadad-Ezer of Zobah sent 20,000 men; from Tob came 12,000; from Maacah 1000. Joab divided his army, left his brother Abishai to oppose the Ammonites, and turned himself with picked men against the Syrians and defeated them before they could join the Ammonites.[291] After this defeat the Ammonites also retired before Abishai into their fortified city of Rabbath-Ammon on the Nahr-Ammon. But in the next spring Hadad-Ezer collected his whole force. David marched across the Jordan to meet the Syrians, and defeated Hadad-Ezer in a decisive battle at Helam; the Israelites carried off the chariots of the enemy for spoil; 1700 horsemen and 20,000 foot-soldiers were captured.[292] David followed up this victory and overran the cities of the king of Zobah, when the king of Damascus took the field in aid of Hadad-Ezer, and the Edomites invaded Judah from the south. David remained in the field against the Syrians, and sent Joab with only a part of the army against the Edomites. In the salt valley, at the southern end of the Dead Sea, Joab and Abishai defeated the Edomites; 12,000 out of 18,000 are said to have fallen on this day.[293] In spite of this severe defeat the Edomites made a stubborn resistance. Joab, in continuous struggles which went on for six months, destroyed a great part of the male population (the son of the king of Edom was carried by the servants of his father to Egypt), and subjugated the rest of the inhabitants to the dominion of David. While Joab was fighting in Edom,