John Gill Commentary 2 Kings 18:17

"And the king of Assyria sent Tartan and Rab-saris and Rabshakeh from Lachish to king Hezekiah with a great army unto Jerusalem. And they went up and came to Jerusalem. And when they were come up, they came and stood by the conduit of the upper pool, which is in the highway of the fuller`s field." — 2 Kings 18:17 (ASV)

And the king of Assyria sent Tartan and Rabsaris, and
Rabshakeh from Lachish to King Hezekiah with a great host against
Jerusalem
Notwithstanding he took the above large sum of money of him, so false and deceitful was he: these were three generals of his army, whom he sent to besiege Jerusalem, while he continued the siege of Lachish; only Rabshakeh is mentioned in (Isaiah 36:2) he being perhaps chief general, and the principal speaker; whose speech, to the end of this chapter, intended to intimidate Hezekiah, and dishearten his people, with some circumstances which attended it, are recorded word for word in (Isaiah 36:1) throughout; (See Gill on Isaiah 36:1) and notes on that chapter.