Psalms 136:17

To him which smote great kings: for his mercy endureth for ever:

God is to be praised as the one who struck down great kings, for his mercy lasts forever. That praise honors the victories through which his people were led into receiving their land as their own. After the captivity, those who returned from exile took up this same praise to recall his past deliverance. In it they remembered his enduring care for his people through all that had befallen them.