Keil & Delitzsch, on 2Kgs 6:18

When the enemy came down to Elisha, he prayed to the Lord that He would smite them with blindness; and when this took place according to his word, he said to them, This is not the way and this is not the city; follow me, and I will lead you to the man whom ye are seeking; and led them to Samaria, which was about four hours' distance from Dothan, where their eyes were opened at Elisha's prayer, so that they saw where they had been led. אליו ויּרדוּ cannot be understood as referring to Elisha and his servant, who went down to the Syrian army, as J. H. Mich., Budd., F. v. Meyer, and Thenius, who wants to alter אליו into אליהם, suppose, but must refer to the Syrians, who went down to the prophet, as is evident from what followed. For the assumption that the Syrians had stationed themselves below and round the mountain on which Dothan stood, and therefore would have had to come up to Elisha, need not occasion an unnatural interpretation of the words. It is true that Dothan stands upon an isolated hill in the midst of the plain; but on the eastern side it is enclosed by a ranger of hills, which project into the plain (see V. de Velde, R. i. p. 273). The Syrians who had been sent against Elisha had posted themselves on this range of hills, and thence they came down towards the town of Dothan, which stood on the hill, whilst Elisha went out of the town to meet them. It is true that Elisha's going out is not expressly mentioned, but in Kg2 6:19 it is clearly presupposed. סנורים is mental blindness here, as in the similar case mentioned in Gen 19:11, that is to say, a state of blindness in which, though a man has eyes that can see, he does not see correctly. Elisha's untruthful statement, "this is not the way," etc., is to be judged in the same manner as every other ruse de guerre, by which the enemy is deceived.