C. F. Keil and Franz Delitzsch on 1 Samuel 15:3

1Sa 15:3

Saul is to smite and ban everything belonging to it without reserve, i.e., to put to death both man and beast. The last clause וגו is only an explanation and exemplification of וגו והחרמתּם. “From man to woman,” etc., i.e., men and women, children and sucklings, etc.

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.