Jewish Views on War and Peace: When the Torah Draws the Sword

The Reluctant Warrior

Judaism is not a pacifist tradition. The Hebrew Bible contains wars commanded by God, celebrated in poetry, and analyzed in law. The book of Joshua is essentially a military campaign. David was a warrior-king. The Maccabees won their freedom through armed revolt. The modern State of Israel was established and has been defended through force of arms.

And yet Judaism is profoundly uncomfortable with war. The same tradition that permits warfare hedges it with restrictions, qualifications, and moral demands that make Jewish military ethics one of the most nuanced systems of just war thinking in human history. The Torah commands soldiers to offer peace before battle, to spare fruit trees during a siege, to allow the fainthearted to go home. The prophets dreamed of a day when swords would become plowshares. The rabbis of the Talmud, living under Roman occupation, channeled military energy into legal argument, declaring that “scholars increase peace in the world.”

Jewish views on war are defined by this tension: the recognition that force is sometimes necessary, combined with the insistence that its use must be constrained by moral law.

Two Categories of War

Jewish law draws a fundamental distinction between two types of war:

Milchemet Mitzvah: Obligatory War

Milchemet mitzvah (literally “war of commandment”) refers to wars that are religiously obligatory. According to Maimonides (Laws of Kings 5:1), these include:

1. The wars of Joshua to conquer the land of Canaan (considered historically completed and no longer applicable)
2. The war against Amalek (the paradigmatic enemy of Israel, whose identity is unknown today)
3. Defensive war — when Israel is attacked, fighting back is not optional but mandatory

The third category is the most relevant today. When Jewish lives are threatened, the obligation to defend them overrides virtually every other consideration. The principle of pikuach nefesh (saving life) applies collectively as well as individually.

In an obligatory war, every able person must fight — even a groom on his wedding night, even a bride under her canopy (Sotah 44b). There are no exemptions.

Milchemet Reshut: Discretionary War

Milchemet reshut (literally “war of permission”) covers wars fought for reasons other than direct self-defense — wars of expansion, preemptive strikes, or strategic advantage.

Discretionary wars require extraordinary authorization: approval by the Sanhedrin (the supreme Jewish court of 71 judges) and consultation with the Urim and Thummim (a priestly oracle). Since neither institution exists today, most authorities hold that milchemet reshut is effectively impossible in the modern era.

This has significant implications. If only defensive wars can be waged, then the entire apparatus of Jewish military ethics is oriented toward defense, not conquest. The tradition permits fighting; it does not celebrate it.

Peace First: Deuteronomy’s Command

One of the most striking features of biblical military law is the requirement to offer peace before attacking:

“When you approach a city to fight against it, you shall offer it terms of peace. If it agrees to your terms of peace and opens its gates to you, then all the people found in it shall become your forced laborers and serve you. But if it does not make peace with you but makes war against you, then you shall besiege it” (Deuteronomy 20:10-12).

Maimonides (Rambam) extends this principle universally: peace must be offered even in obligatory wars, even against the seven Canaanite nations, even against Amalek. No war may begin without first exhausting the possibility of peaceful resolution (Laws of Kings 6:1).

The terms of peace, according to Maimonides, include acceptance of the seven Noahide laws (basic moral principles incumbent on all humanity) and payment of tribute. The emphasis is not on subjugation but on establishing minimal moral order.

This peace-first requirement influenced later developments in just war theory — the tradition of moral reasoning about when and how war may be waged that runs from Augustine and Aquinas through Hugo Grotius and into modern international humanitarian law.

Exemptions from Battle

Deuteronomy 20:5-8 lists categories of people who may be excused from military service:

• A man who has built a new house but not yet dedicated it
• A man who has planted a vineyard but not yet harvested it
• A man who has betrothed a woman but not yet married her
• Anyone who is afraid and fainthearted

The first three exemptions preserve the ability to enjoy the fruits of one’s labor — a recognition that life’s pleasures are worth protecting. The fourth exemption is remarkable: the Torah explicitly permits cowardice as a legitimate reason for exemption. The Talmud debates what “fainthearted” means — Rabbi Akiva says it means genuinely afraid of battle; Rabbi Yose HaGelili says it means afraid because of sins one has committed. Either way, forcing terrified people to fight serves no one’s interest.

These exemptions apply only to discretionary wars. In obligatory (defensive) wars, everyone fights.

Bal Tashchit: Don’t Destroy the Trees

Among the most famous military regulations in the Torah is the prohibition against destroying fruit trees during a siege:

“When you besiege a city for many days, fighting against it to capture it, you shall not destroy its trees by wielding an ax against them. You may eat from them, but you shall not cut them down. Are the trees of the field human, that they should be besieged by you?” (Deuteronomy 20:19-20).

The question — “Are the trees of the field human?” — is one of the Torah’s most poignant moments. In the midst of legislation about warfare, the text pauses to consider the trees. They are not combatants. They bear no responsibility. Why should they suffer?

The rabbis expanded bal tashchit (“do not destroy”) far beyond its original military context into a comprehensive prohibition against wanton destruction of anything useful — food, clothing, buildings, water sources, natural resources. It became one of Judaism’s foundational environmental principles.

In military terms, bal tashchit establishes a principle of proportionality: even when war is justified, the destruction it causes must be limited to what is militarily necessary. Scorched-earth tactics, deliberate environmental devastation, and attacks on civilian food supplies all violate this principle.

Rodef Shalom: The Pursuit of Peace

If war is sometimes necessary, peace is always the goal. The phrase rodef shalom (“pursuer of peace”) appears throughout rabbinic literature as one of the highest virtues a person can embody.

The Mishnah teaches: “Be of the disciples of Aaron — loving peace and pursuing peace, loving people and drawing them close to Torah” (Avot 1:12). The verb is significant: peace is not merely desired or hoped for but pursued — actively, relentlessly, with the same energy that a hunter pursues prey.

The prophetic vision is unambiguous:

“They shall beat their swords into plowshares and their spears into pruning hooks. Nation shall not lift up sword against nation, neither shall they learn war anymore” (Isaiah 2:4).

This vision of universal peace is not presented as naive idealism but as the culmination of history — the messianic era when war itself will be abolished. Until that era arrives, war may be necessary. But the direction of history, in Jewish thought, is toward its elimination.

The IDF and “Purity of Arms”

The modern State of Israel has confronted the theory-practice gap in Jewish military ethics with urgent intensity. The Israel Defense Forces (IDF) adopted the concept of Tohar HaNeshek (“Purity of Arms”) as a foundational ethical principle: soldiers must use their weapons only when necessary, must minimize harm to civilians, and must maintain moral standards even in combat.

The IDF’s ethical code draws on both Jewish tradition and international humanitarian law. It mandates:

• Distinction between combatants and civilians
• Proportionality in the use of force
• Military necessity as a prerequisite for any use of force
• Respect for the dignity of all persons, including enemies and prisoners

In practice, applying these principles in asymmetric warfare — particularly in urban combat where combatants operate among civilians — has been enormously controversial. Critics argue that Israel’s actual conduct often falls short of its stated principles. Defenders argue that the principles themselves represent a genuine attempt to wage war ethically.

The Minority Pacifist Tradition

While mainstream Judaism is not pacifist, a minority pacifist tradition exists within Jewish thought. After the catastrophic Bar Kokhba revolt (132–135 CE), in which hundreds of thousands died, many rabbis turned sharply away from military solutions. Rabbi Yochanan ben Zakkai’s escape from besieged Jerusalem — choosing surrender and spiritual survival over military resistance — became a model for the rabbinic alternative to warfare.

In the modern period, Jewish pacifists have drawn on prophetic texts, the principle of pikuach nefesh (which prioritizes saving life above all), and the devastating historical experience of Jewish communities caught in wars. The Jewish Peace Fellowship (founded 1941) advocates for conscientious objection and nonviolent conflict resolution.

The Unresolved Tension

Jewish tradition does not resolve the tension between war and peace — it lives within it. The Torah commands both fighting when necessary and seeking peace always. The prophets envision a world without war while acknowledging that the present world still requires it. The rabbis celebrate peace as the highest value while recognizing self-defense as an obligation.

This unresolved tension is not a failure of the tradition. It is its wisdom. Easy answers — pure pacifism in a world of aggressors, or militarism unrestrained by moral law — are both insufficient. Judaism insists on holding both truths: that war is sometimes unavoidable, and that it is always a failure. That soldiers must be brave, and that the bravest thing is to pursue peace. That the sword exists, and that its ultimate destiny is to become a plowshare.

The tension remains. The pursuit of peace continues. And the trees — which are not human, and should not be besieged — still grow.