Adam Clarke on 2 Chronicles 7:22

Because they forsook the Lord - While they cleaved to God, the most powerful enemy could make no impression on them; but when they forsook him, then the weakest and most inconsiderable of their foes harassed, oppressed, and reduced them to bondage and misery. It was by no personal prowess, genuine heroism, or supereminent military tactics, that the Jews were enabled to resist and overcome their enemies; it was by the Divine power alone; for, destitute of this, they were even worse than other men.