Kautilya's Arthashastra 13.4.52

13.4.52

paradurgam avaskandya skandhāvāraṃ vā patitaparānmukhābhipannam uktakeśaśastrabhayavirūpebhyaś cābhayam ayudhyamānebhyaś ca dadyuḥ //

Having captured the fort or having returned to the camp after its capture, he should give quarter to those of the enemy's army who, whether as lying prostrate in the field, or as standing with their back turned to the conqueror, or with their hair dishevelled, with their weapons thrown down or with their body disfigured and shivering under fear, surrender themselves. After the captured fort is cleared of the enemy's partisans and is well guarded by the conqueror's men both within and without, he should make his victorious entry into it.