What does Isaiah 36:2 mean?

Then the king of Assyria sent his top commander from Lachish to Jerusalem, to King Hezekiah, with a huge army. He stopped at the aqueduct by the upper pool, on the road to the field where clothes are washed. Isaiah 36:2 - Modern Text Bible

(The Assyrian commander comes right up to Jerusalem’s walls, making a show of force. The location is strategic—right where people would see and hear him.)