I Samuel 15:4

Saul summoned the people to war, and mustered them (those who were summoned) at Telaim (this was probably the same place as the Telem mentioned in Jos 15:24, and is to be looked for in the eastern portion of the Negeb). "Two hundred thousand foot, and ten thousand of the men of Judah:" this implies that the two hundred thousand were from the other tribes. These numbers are not too large; for a powerful Bedouin nation, such as the Amalekites were, could not possibly be successfully attacked with a small army, but only by raising the whole of the military force of Israel. Sa1 15:5 He then advanced as far as the city of the Amalekites, the situation of which is altogether unknown, and placed an ambush in the valley. ויּרב does not come from ריב, to fight, i.e., to quarrel, not to give battle, but was understood even by the early translators as a contracted form of ויּארב, the Hiphil of ארב. And modern commentators have generally understood it in the same way; but Olshausen (Hebr. Gramm. p. 572) questions the correctness of the reading, and Thenius proposes to alter בּנּחל ויּרב into מלחמה ויּערך. נחל refers to a valley in the neighbourhood of the city of the Amalekites. Sa1 15:6-7 Saul directed the Kenites to come out from among the Amalekites, that they might not perish with them (אספך, imp. Kal of אסף), as they had shown affection to the Israelites on their journey out of Egypt (compare Num 10:29 with Jdg 1:16). He then smote the Amalekites from Havilah in the direction towards Shur, which lay before (to the east of) Egypt (cf. Gen 25:18). Shur is the desert of Jifar, i.e., that portion of the desert of Arabia which borders upon Egypt (see at Gen 16:7). Havilah, the country of the Chaulotaeans, on the border of Arabia Petraea towards Yemen (see at Gen 10:29). Sa1 15:8-9…

In this chapter we have the final rejection of Saul from being king, for his disobedience to God's command in not utterly destroying the Amalekites. By his wars and victories he hoped to magnify and perpetuate his own name and honour, but, by his mismanagement of them, he ruined himself, and laid his honour in the dust. Here is, I. The commission God gave him to destroy the Amalekites, with a command to do it utterly (Sa1 15:1-3). II. Saul's preparation for this expedition (Sa1 15:4-6). III. His success, and partial execution of this commission (Sa1 15:7-9). IV. His examination before Samuel, and sentence passed upon him, notwithstanding the many frivolous pleas he made to excuse himself (v. 10-31). V. The slaying of Agag (Sa1 15:32, Sa1 15:33). VI. Samuel's final farewell to Saul (Sa1 15:34, Sa1 15:35).

15:4 Telaim: Possibly Telem (Josh 15:24).