Al-Anfal 8:57

Fa-imma tathqafannahum fee alharbifasharrid bihim man khalfahum laAAallahum yaththakkaroon

So if you, [O Muḥammad], gain dominance over them in war, disperse by [means of] them those behind them that perhaps they will be reminded.

So, if you find them in war, deal with them in a way that those behind them have to disperse fearfully, so that they take a lesson.