Deuteronomy 20: War, Fear, and Faith

Short answer: Deuteronomy 20 records Moses' instructions to Israel about going to war: trusting God, exempting certain men, offering peace to distant cities, and dealing with enemy nations. It emphasizes reliance on God and obedience to His commands.

What Deuteronomy 20 says

The chapter opens with a call to courage. When Israel goes out to battle and sees horses, chariots, and a people more numerous, they are not to be afraid, because Yahweh their God is with them, the one who brought them up out of Egypt. As they draw near to the battle, the priest approaches and speaks to the people, telling them not to let their hearts faint, not to be afraid, tremble, or be scared, for Yahweh their God goes with them to fight for them and to save them. This sets the tone: the battle belongs to God, and the people must trust Him rather than their own strength or numbers.

The officers then speak to the people, granting exemptions from military service. A man who has built a new house but not dedicated it may return home, lest he die and another dedicate it. A man who has planted a vineyard but not used its fruit may return, lest another use it. A man who has pledged to be married but not taken his wife may return, lest another take her. The officers also address the fearful and faint-hearted, sending them home so that their brothers' hearts do not melt. After these announcements, captains are appointed to lead the army. These provisions show God's care for ordinary human joys and the importance of wholehearted commitment.

When Israel draws near to a city to fight against it, they are to proclaim peace to it. If the city answers peace and opens, all the people become forced laborers and serve Israel. If it refuses peace and makes war, Israel is to besiege it. When Yahweh delivers it into their hand, they are to strike every male with the edge of the sword, but the women, little ones, livestock, and all plunder they may take for themselves. This is to be done to cities very far off, not to the cities of the nations that Yahweh gives them as an inheritance. For those nations, they are to save alive nothing that breathes, utterly destroying the Hittite, Amorite, Canaanite, Perizzite, Hivite, and Jebusite, as Yahweh commanded, so that they do not teach Israel to follow their abominations and cause Israel to sin against Yahweh.

The chapter closes with a rule for siege warfare: when besieging a city for a long time, Israel must not destroy its trees by wielding an ax against them, for they may eat of them. They must not cut them down, for the tree of the field is not a man to be besieged. Only trees that are not for food may be destroyed and cut down to build bulwarks against the city until it falls. This final instruction shows a concern for sustaining life and not acting out of mere destruction, even in war.

Verses that carry the chapter

• “When you go out to battle against your enemies, and see horses, chariots, and a people more numerous than you, you shall not be afraid of them; for Yahweh your God is with you, who brought you up out of the land of Egypt.” (Deuteronomy 20:1) — This verse sets the foundation for the entire chapter: courage in battle comes from recognizing that Yahweh is with His people, the same God who delivered them from Egypt. It shifts focus from military might to divine presence.
• “for Yahweh your God is he who goes with you, to fight for you against your enemies, to save you.”” (Deuteronomy 20:4) — This verse summarizes the priest's encouragement: Yahweh goes with them to fight for them and to save them. It is a clear statement of divine initiative in battle, reinforcing trust over fear.
• “The officers shall speak further to the people, and they shall say, “What man is there who is fearful and faint-hearted? Let him go and return to his house, lest his brother’s heart melt as his heart.” (Deuteronomy 20:8)” (Deuteronomy 20:8) — This verse addresses the fearful, allowing them to return home so they do not discourage others. It highlights the importance of wholeheartedness and the reality that fear can spread, but God's people are to be led with compassion and realism.
• “that they not teach you to follow all their abominations, which they have done for their gods; so would you sin against Yahweh your God.” (Deuteronomy 20:18) — This verse gives the reason for the utter destruction of certain nations: so they do not teach Israel to follow their abominations and cause Israel to sin against Yahweh. It underscores the spiritual danger of compromise and the priority of covenant loyalty.

Gospel connection

Deuteronomy 20 anticipates the gospel by showing that God fights for His people and saves them, not by their own strength but by His presence. The ultimate battle against sin and death was won by Jesus Christ, who fought and conquered on behalf of His people. Just as Israel was called to trust God in warfare, believers are called to trust Christ, who has already secured the victory. The chapter's concern for holiness, avoiding the abominations of the nations, points to the need for a heart transformed by grace, which the gospel provides through the work of the Holy Spirit.

Application

This chapter asks readers to trust God in the face of overwhelming odds, to prioritize wholehearted service, and to pursue holiness by avoiding the influences that lead to sin. It also encourages a posture of peacemaking where possible, as seen in the offer of peace to distant cities. For modern readers, it challenges fear and self-reliance, calling for reliance on God's presence and a commitment to obey His commands, even when they seem difficult. It also reminds us that God cares about ordinary life, such as homes, vineyards, and marriages, and that He values the well-being of His people.

Biblical fidelity check

The chapter does not claim that Israel's military success was due to their own skill or numbers, but repeatedly attributes victory to Yahweh's presence and deliverance. It does not specify the historical context beyond the wilderness setting, nor does it name the specific enemies Israel would face. It is silent on the exact timing of these instructions or how they were implemented. It does not address the moral complexities of warfare beyond the commands given, nor does it explain why certain nations were singled out for destruction beyond the reason in verse 18. The text does not claim that these laws are universal for all times, but are given to Israel as they enter the land.

Questions for study

1. What reasons does the chapter give for Israel not to fear their enemies, and how might those reasons apply to believers today?
2. Why do you think the officers exempted men with new houses, vineyards, or engagements from battle? What does this reveal about God's priorities?
3. How does the offer of peace to a distant city before siege reflect God's character? How should this shape our approach to conflict?
4. What is the stated reason for the complete destruction of certain nations in verses 16 to 18? How do we reconcile this with the command to love?
5. In what ways does the instruction about trees during a siege show concern for creation and human need? How can we apply this principle today?

Keep reading

Related studies: Deuteronomy 1 Bible Study, Deuteronomy 10 Bible Study, Deuteronomy 11 Bible Study, Deuteronomy 12 Bible Study.

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FAQ

Why did God command Israel to completely destroy certain nations?

Verse 18 explains that it was to prevent those nations from teaching Israel to follow their abominations and sin against Yahweh. It was a measure to protect Israel's covenant relationship with God.

Does Deuteronomy 20 promote aggressive warfare?

No, the chapter first requires offering peace to a distant city before attacking. Only if peace is refused does Israel besiege it. The instructions are specific to Israel's entry into the promised land and are not a general mandate for all wars.

What can we learn from the exemptions for new house builders, vineyard planters, and newlyweds?

These exemptions show that God values human life, family, and the enjoyment of legitimate blessings. They also ensure that soldiers are not distracted by unfinished personal matters, promoting wholehearted service.