That we also may be like all the nations; and that our king may judge us, and go out before us, and fight our battles.

Wesley's Notes

8:20 Be like - What stupidity! It was their happiness that they were unlike all other nations, Numb 23:9 Deut 33:28, as in other glorious privileges, so especially in this, that the Lord was their immediate king and lawgiver. But they will have a king to go out before them, and to fight their battles. Could they desire a battle better fought for them than the last was, by Samuel's prayers and God's thunders? Were they fond to try the chance of war, at the same uncertainty that others did? And what was the issue? Their first king was slain in battle: and so was Joshua, one of the last and best.

Matthew Henry's Concise Commentary

8:10-22 If they would have a king to rule them, as the eastern kings ruled their subjects, they would find the yoke exceedingly heavy. Those that submit to the government of the world and the flesh, are told plainly, what hard masters they are, and what tyranny the dominion of sin is. The law of God and the manner of men widely differ from each other; the former should be our rule in the several relations of life; the latter should be the measure of our expectations from others. These would be their grievances, and, when they complained to God, he would not hear them. When we bring ourselves into distress by our own wrong desires and projects, we justly forfeit the comfort of prayer, and the benefit of Divine aid. The people were obstinate and urgent in their demand. Sudden resolves and hasty desires make work for long and leisurely repentance. Our wisdom is, to be thankful for the advantages, and patient under the disadvantages of the government we may live under; and to pray continually for our rulers, that they may govern us in the fear of God, and that we may live under them in all godliness and honesty. And it is a hopeful symptom when our desires of worldly objects can brook delay; and when we can refer the time and manner of their being granted to God's providence.