C. F. Keil and Franz Delitzsch on 2 Kings 19:9

2Ki 19:9

There Sennacherib heard that Tirhakah was advancing to make war against him. Tirhakah, Θαρακά (lxx), king of Cush, is the Ταρακός of Manetho, the successor of Sevechus (Shebek II), the third king of the twenty-fifth (Ethiopian) dynasty, described by Strabo (xv. 687), who calls him Τεάρκων, as a great conqueror. His name is spelt Tåhålqa or Tåharqo upon the monuments, and on the Pylon of the great temple at Medinet-Abu he is represented in the form of a king, cutting down enemies of conquered lands (Egypt, Syria, and Tepopå, an unknown land) before the god Ammon (see Brugsch, hist. d'Egypte, i. pp. 244,245).According to Jul. Afric. (in Syncell. i. p. 139, ed. Dind.) he reigned eighteen years, according to Euseb. (in Syncell. p. 140) twenty years. Both statements are incorrect; for, according to an Apis-stele published by Mariette, the birth of an Apis who died in the twentieth year of Psammetichus fell in the twenty-sixth year of Tirhakah, so that the reign of Tirhakah may be supposed to have lasted twenty-eight years (see Brugsch, l.c. p. 247). But the chronological conclusions respecting the date of his reign are very uncertain. Whereas M. v. Niebuhr (Gesch. Ass. p. 72) fixes his expedition against Sennacherib in the thirty-seventh aer. Nab., i.e., 710 b.c., and the commencement of his reign over Egypt in 45 aer. Nab., i.e., 702 b.c., and assumes that he marched against Sennacherib before he was king of Egypt, which is apparently favoured by the epithet king of Cush, not of Egypt; Brugsch (l.c. p. 292) has given the year 693 b.c. as the commencement of his reign. It is obvious that this statement is irreconcilable with the O.T. chronology, since the fourteenth year of Hezekiah, in which Sennacherib invaded Judah, corresponds to the year 714 or 713 b.c. These diversities simply confirm our remark (p. 411), that the chronological data as to the kings of Egypt before Psammetichus cannot lay any claim to historical certainty. For an attempt to solve this discrepancy see M. v. Niebuhr, pp. 458ff.  - On hearing the report of the advance of Tirhakah, Sennacherib sent ambassadors again to Hezekiah with a letter (2Ki 19:14), in which he summoned him once more to give up his confidence in his God, and his assurance that Jerusalem would not be delivered into the hands of the king of Assyria, since the gods of no other nation had been able to save their lands and cities from the kings of Assyria who had preceded him. The letter contained nothing more, therefore, than a repetition of the arguments already adduced by Rabshakeh (2Ki 18:19.), though a larger number of the lands conquered by the Assyrians are given, for the purpose of strengthening the impression intended to be made upon Hezekiah of the irresistible character of the Assyrian arms. - To offer a successful resistance to Tirhakah and overcome him, Sennacherib wanted above all things a firm footing in Judah; and for this the possession of Jerusalem was of the greatest importance, since it would both cover his back and secure his retreat. Fortifications like Lachish and Libnah could be quickly taken by a violent assault. But it was very different with Jerusalem. Salmanasar had stood before Samaria for three years before he was able to conquer it; and Nebuchadnezzar besieged Jerusalem for two years before the city was starved out and it was possible to take it (2Ki 25:1.). But as Tirhakah was approaching, Sennacherib had no time now for so tedious a siege. He therefore endeavoured to induce Hezekiah to surrender the city quietly by a boastful description of his own power. Instead of ויּשׁלח ויּשׁב (2Ki 19:9), we have in Isaiah ויּשׁלח ויּשׁמע, “when he heard this he sent,” which is probably the more original, and indicates that when Sennacherib received the intelligence he sent at once (Drechsler).