Then Asa went out against him,.... Notwithstanding he brought so great an army with him: and they set the battle in array in the valley of Zephathah at Mareshah; where the Ethiopians were; he did not stay till they got further into his country, but marched against them when on the frontiers of it, and chose the valley to pitch in, as being more to the advantage of his smaller army; see Jdg 1:17.