An interval of time must be placed between this verse and the last. Sennacherib, content with his successes, had returned to Nineveh with his spoil and his numerous captives. Hezekiah, left to himself, repented of his submission, and commenced negotiations with Egypt 2Ki 18:21, 2 Kings 18:24; Isaiah 30:2-6; Isaiah 31:1, which implied treason against his Assyrian suzerain. It was under these circumstances that Sennacherib appears to have made his second expedition into Palestine very soon after the first. Following the usual coast route he passed through Philistia on his way to Egypt, leaving Jerusalem on one side, despising so irony a state, and knowing that the submission of Egypt would involve that of her hangers-on. While, however, he was besieging Lachish on his way to encounter his main enemy, he determined to try the temper of the Jews by means of an embassy, which he accordingly sent.
Tartan and Rabsaris and Rab-shakeh - None of these are proper names. “Tartan” was the ordinary title of an Assyrian general; “Rab-saris” is “chief eunuch,” always a high officer of the Assyrian court; Rab-shakeh is probably “chief cup-bearer.”
By the conduit of the upper pool - Possibly a conduit on the north side of the city near the “camp of the Assyrians.” The spot was the same as that on which Isaiah had met Ahaz Isaiah 7:3.