He smote. — He it was who smote. The reduction of the Philistines was probably subsequent to the retreat of Sennacherib. (Comp. 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.