Charles Ellicott Commentary 2 Kings 18:8

"He smote the Philistines unto Gaza and the borders thereof, from the tower of the watchmen to the fortified city." — 2 Kings 18:8 (ASV)

He smote. — It was he who smote. The subjugation of the Philistines probably occurred after the retreat of Sennacherib. (Compare 2 Chronicles 32:22; Isaiah 11:14.)

Unto Gaza. — The southernmost part of the Philistine territory.

From the tower of the watchmen ... city. — See Note on 2 Kings 17:9. The entire land of Philistia was ravaged by the Judean forces.