Rashi on Genesis
כשביות חרב AS CAPTIVES TAKEN BY THE SWORD — an army going to war is termed “sword”.
Radak on Genesis
ויאמר...כשבויות, like women taken captives by creditors that are kidnapped without their husbands being informed. This is how you treated my daughters.
Siftei Chakhamim
An army going to war is called “sword.” [Rashi explains this] because “prisoners” are not of a חרב (sword). It should have said, “Prisoners of an army.”