Commentary for Kiddushin 43:2
ולקחת ליקוחין יש לך בה לך לאשה שלא יקח שתי נשים אחת לו ואחת לאביו אחת לו ואחת לבנו (דברים כא, יב) והבאתה מלמד שלא ילחצנה במלחמה:
over her;<span class="x" onmousemove="('comment',' Though she is a heathen, and does not voluntarily accept conversion. - Also, she can only be taken as a legal wife.');"><sup>4</sup></span> 'to thee to wife,' [teaching] that he must not take two women, one for himself and another for his father, or one for himself and another for his son: 'then thou shalt bring her home [to thine house].' teaching that he must not molest her on the [field of] battle.<span class="x" onmousemove="('comment',' Nevertheless one is able to bridle his desire in the knowledge that he will be able to satisfy it at home. Rashi. - War cannot be humanized, nor primitive passions subdued. Yet the Rabbis endeavoured to curb them as far as possible and minimize their evil effects: the captive was to be kindly treated, given the full legal status of a wife, and unmolested in actual battle, - possibly because in cool blood he would altogether recoil from his intentions.');"><sup>5</sup></span>
Rashi on Kiddushin
Daf Shevui to Kiddushin
1) This rule applies only when in war. This is not something that can be done in peace time.
2) The rule applies even if she is already married to a non-Jewish man.
3) The reason that the Torah calls her beautiful is that it realizes the evil inclination of men. The Torah preferred to the lesser evil of basically forced marriage to what would basically be rape. This is a concession, not an ideal
4) While the Torah calls her beautiful, the law applies to any woman the man desires.
5) The soldier can only take one such wife, not two.
6) He must marry her (after the first intercourse).
7) He cannot take two women, one for him and one for a family member.
8) He cannot have sex with her there on the battlefield. He must bring her home.
Note that while there is still much that is disturbing in these laws (what about her consent?) the rabbis do seem to be modifying the Torah’s rulings such that the situation is slightly better for her.