﴿ يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ خُذُوا۟ حِذْرَكُمْ فَٱنفِرُوا۟ ثُبَاتٍ أَوِ ٱنفِرُوا۟ جَمِيعًۭا ﴾

“O YOU who have attained to faith! Be fully prepared against danger, whether you go to war in small groups or all together.”

Please check ayah 4:74 for complete tafsir.