To him which smote great kings: for his mercy endureth for ever:
To him which smote great kings ... Sihon ... And Og - (Psalms 135:11.) The Psalmist signifies these kings because the MERCY of the Lord is here his theme. The gift of the kingdoms of Sihon and Og to Israel was the fruit of pure liberality and mercy, without any promise; whereas the gift of the Canaanite land was the fruit of His truth and faithfulness to His promises (Muis).