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International Humanitarian Law Principles

Oct 11, 2025

Overview

This lecture explains key principles of international humanitarian law (IHL) governing how wars are conducted to protect civilians and limit destruction.

Purpose and Basis of IHL in Warfare

  • IHL sets agreed rules for conducting warfare to protect civilian populations.
  • Rules specify lawful targets and permissible methods of attack.
  • IHL balances military necessity with humanity.
  • These rules apply regardless of the reasons behind the conflict.

Core Principles of IHL

  • Three main principles: distinction, proportionality, and precautions.
  • All three principles must be respected for attacks to be lawful.

Principle of Distinction

  • Parties must always distinguish between civilians and combatants, and between civilian and military objects.
  • Attacks on military objectives (including combatants) are permitted.
  • Civilians, the civilian population, and civilian objects must never be attacked.
  • Indiscriminate attacks, which fail to distinguish targets, are prohibited.

Principle of Proportionality

  • Attacks likely to cause excessive incidental civilian loss compared to expected military advantage are forbidden.
  • Civilian losses must not outweigh the concrete and direct military gain.

Principle of Precautions

  • Constant care must be taken to protect civilians during military operations.
  • Active precautions: verify targets, cancel or suspend attacks if targets aren't military objectives, give effective advance warnings when possible.
  • Passive precautions: take all feasible steps to shield civilians and civilian objects under one's control from attack effects.

Combined Role of the Principles

  • Distinction, proportionality, and precautions work together to limit suffering and destruction during war.
  • These principles aim to reduce war’s most devastating effects, even if they cannot prevent wars entirely.

Key Terms & Definitions

  • International Humanitarian Law (IHL) — Legal rules regulating armed conflict to protect civilians.
  • Distinction — Differentiating between combatants/military objectives and civilians/civilian objects.
  • Proportionality — Ensuring civilian harm is not excessive compared to anticipated military advantage.
  • Precautions — Active and passive measures to protect civilians and civilian objects during attacks.
  • Indiscriminate Attacks — Attacks that do not distinguish between military and civilian targets.

Action Items / Next Steps

  • Review examples of each principle in recent conflicts.
  • Prepare questions on practical challenges in applying these rules.