Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[59] On the next day, Moses stripped the dead bodies of their enemies, and gathered together the armor of those that were fled, and gave rewards to such as had signalized themselves in the action; and highly commended Joshua, their general, who was attested to by all the army, on account of the great actions he had done. Nor was any one of the Hebrews slain; but the slain of the enemy's army were too many to be enumerated. So Moses offered sacrifices of thanksgiving to God, and built an altar, which he named The Lord the Conqueror. He also foretold that the Amalekites should utterly be destroyed; and that hereafter none of them should remain, because they fought against the Hebrews, and this when they were in the wilderness, and in their distress also. Moreover, he refreshed the army with feasting. And thus did they fight this first battle with those that ventured to oppose them, after they were gone out of Egypt. But when Moses had celebrated this festival for the victory, he permitted the Hebrews to rest for a few days, and then he brought them out after the fight, in order of battle; for they had now many soldiers in light armor. And going gradually on, he came to Mount Sinai, in three months' time after they were removed out of Egypt; at which mountain, as we have before related, the vision of the bush, and the other wonderful appearances, had happened.

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