Ki Tzeitzei- כִּֽי־תֵצֵ֥א - Deuteronomy 21:10-25:19 Making Torah Personal ~ Tzedek

Bullet Points: this parsha contains 74 mitzvot, more than any other
Laws pertain to spoils of war, marriage and family relationships, agricultural, ritual, moral and humane considerations.
Many laws here are the origins of core values: Honoring the dead כבוד המת Restoring lost property השבת אבדה Kindness to animals, צער בעלי חיים
To be more generous, the sheer number of mitzvot in this parsha merit a larger description. The laws cover these areas: laws governing warfare, slavery, inheritance rights of the first born, property laws, burial of the dead, humane treatment of animals, parenting issues and subsequent guilt, fair labor practices, safety requirements of roofs and balconies, obligations towards the property of other people, divorce, and kidnapping plus respect and care of the poor, the orphan and the widow, even clothing...plus business laws concerning honest weights and measures.

With such a wide range of rules and regulations, Ki Teitzei is almost a mini-Torah of its own, a little blueprint for how to establish a righteous and compassionate society. ~ Rabbi Arthur Green

The Hebrew phrase al oyvecha, “on your enemies,” can also be understood in the literal sense of “on top of your enemies.” In every battle, the way to achieve victory is to gain the higher ground. We must never stoop to the level of evil to fight it on its own terms; in the words of our sages, “One who wrestles with a filthy person becomes dirtied as well.” Rather, we should rise above it, affirming our belief that there is no true existence other than G‑d, and that nothing contrary to His goodness and truth has any real power. When our going to war is in a manner of “on your enemies,” we are guaranteed that “G‑d shall deliver them into your hands.” ~The Chassidic Masters

Also from one’s spiritual enemies one must “capture captives” וְשָׁבִ֥יתָ שִׁבְיֽוֹ
Anything negative in man or in the world can be exploited for the good, if one can derive a lesson from it in the service of the Creator. ~ The Ba'al Shem Tov - [Besht]

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Rabbi Yehuda Aryeh Leib Alter, known by his seminal work, The S'fat Emet [c.1860 - c.1900 CE] makes note of the different verb tenses. The verse begins by referring to many enemies, but then it says that God will deliver a single enemy — "him into your hand" וּנְתָנ֞וֹ

The Sfat Emet understands this as referring to the internal enemy — the natural human tendency to cut corners, to cheat, not to tell the whole truth, and worse. In short, the enemy referred to in the verses is the personal, human inclination to do evil.
The last part of the verse: "and you take some of them captive." can also be translated in the singular in the original Hebrew: "and you take him (or "it") captive." וְשָׁבִ֥יתָ שִׁבְיֽוֹ

By taking the yetzer hara captive we can overcome our natural human tendency for committing evil / making bad choices. In this "battle", "God will [give you the strength if you are open, to] deliver it into your hand."
[with thanks to, and adapted from Rabb Reuven Firestone]