13 and discard the clothes she was wearing when captured. She is then to stay in your home for a full month, mourning her father and mother. Then you may go to bed with her as husband and wife.

Matthew Henry's Commentary on Deuteronomy 21:13

Commentary on Deuteronomy 21:10-14

(Read Deuteronomy 21:10-14)

By this law a soldier was allowed to marry his captive, if he pleased. This might take place upon some occasions; but the law does not show any approval of it. It also intimates how binding the laws of justice and honour are in marriage; which is a sacred engagement.