C. F. Keil and Franz Delitzsch on 2 Kings 19:24

2Ki 19:24 2Ki 19:24 refers to the intended conquest of Egypt. Just as Lebanon could not stop the expeditions of the Assyrians, or keep them back from the conquest of the land of Canaan, so the desert of et Tih, which separated Egypt from Asia, notwithstanding its want of water (cf. Herod. iii. 5; Rob. Pal. i. p. 262), was no hindrance to him, which could prevent his forcing his way through it and laying Egypt waste. The digging of water is, of course, not merely “a reopening of the wells that had been choked with rubbish, and the cisterns that had been covered up before the approaching enemy” (Thenius), but the digging of wells in the waterless desert. זרים מים, strange water, is not merely water belonging to others, but water not belonging to this soil (Drechsler), i.e., water supplied by a region which had none at other times. By the perfects the thing is represented as already done, as exposed to no doubt whatever; we must bear in mind, however, that the desert of et Tih is not expressly named, but the expression is couched in such general terms, that we may also assume that it includes what the Assyrian had really effected in his expeditions through similar regions. The drying up of the rivers with the soles of the feet is a hyperbolical expression denoting the omnipotence with which the Assyrian rules over the earth. Just as he digs water in the desert where no water is to be had, so does he annihilate it where mighty rivers exist. Compare the similar boasting of Alarich, already quoted by earlier commentators, in Claudian, de bello Geth. v. 526ff.: cum cesserit omnis

Obsequiis natura meis? subsidere nostris

Sub pedibus montes, arescere vidimus amnes. v. 532. Fregi Alpes. galeis Padum victricibus hausi.) יאורי are the arms and canals of the Yeor, i.e., of the Nile. מצור, a rhetorical epithet for Egypt, used not only here, but also in Isa 19:6 and Mic 7:12.