Judges 20:22,23 - Joseph Benson’s Commentary on the Old and New Testaments

The men of Israel encouraged Hebrew, strengthened themselves, supporting themselves with the consciousness of the justice of their cause, and putting themselves in better order for defending themselves, and annoying their enemies. The children of Israel wept Not so much for their sins, as for their defeat and loss. My brother They impute their ill success, not to their own sins, but to their taking up arms against their brethren. But still they persist in their former neglect of seeking God's assistance in the way which he had appointed, as they themselves acknowledged presently, by doing those very things which now they neglected.