text: Chapter 2
  Actions of Occupying Force
  If the occupying military force acts in a manner consistent with the conditions necessary to maintain
  undefended status, the city, town, or village will remain undefended for the purpose of protecting it against
  military operations by all parties to the conflict. The occupying force, however, does have the authority
  unilaterally to use the city, town, or village for military operations, including establishment of defenses to
  prevent its recapture by the enemy. If it does so, the locality will lose its undefended status and military
  objectives within the city may be subject to attack and the city itself subject to capture by opposing ground
  forces.
  STARVATION
  Starvation is a legitimate method of war, but it must be conducted in accordance with the principles
  of discrimination and proportionality, as well as other LOAC rules. It is a legitimate method to starve enemy
  forces in order to lead to the speedier defeat of the enemy or its submission with fewer friendly force
  casualties. For example, it is not prohibited to destroy food intended as sustenance for enemy forces with a
  view towards weakening them and diverting their resources. Enemy forces, for the purpose of this rule, means
  those persons constituting military objectives (see paragraph 2-60 for categories of persons subject to attack).
  Starvation specifically directed against the enemy civilian population, however, is prohibited (consider AP I
  art. 54). For example, it would be prohibited to destroy food or water supplies for the purpose of denying
  sustenance to the civilian population.
  In this regard, it is prohibited to attack, destroy, remove, or render useless objects indispensable to
  the survival of the civilian population of an enemy nation, such as foodstuffs, agricultural areas for the
  production of foodstuffs, crops, livestock, drinking water installations, and supplies for irrigation works, for
  the purpose of denying their sustenance value to the civilian population (consider AP I art. 54(2)).
  This rule would not prohibit attacks that are carried out for specific purposes other than to deny food
  and water. For example, this rule would not prohibit the destroying of a field of crops to prevent it from being
  used as concealment by the enemy forces or destroying a supply route that is used to move military supplies
  but that is also used to supply the civilian population with food, subject to the principle of proportionality,
  including taking feasible precautions.
  These prohibitions may not apply if these objects may be, or are, used by enemy military forces.
  Restrictions on starvation do not prohibit measures being taken if their purpose is to deny consumption of
  food or water by enemy military forces. Military action intended to starve enemy forces must not be taken
  when it is expected to result in incidental harm to the civilian population that is excessive in relation to the
  military advantage expected to be gained pursuant to the principle of proportionality.
  Similarly, public utilities (such as electric power grids) may be attacked to deny power to enemy
  military forces and installations (for example, an integrated air defense system or national command, control,
  communications, computers, and intelligence assets) even though such attacks may adversely affect the
  supply of power to the civilian population or civilian objects, or the provision of sustenance for the civilian
  population (for example, water). Commanders authorizing such attacks should determine the anticipated
  effect of those attacks on the civilian population to ensure that such effects are not excessive compare to the
  military advantage expected to be gained. Commanders should also consider taking precautions to ensure
  that the civilian population is not left with inadequate water supplies. The poisoning of the water supply is
  prohibited under all circumstances (HR art. 23(a)).
  PROTECTION OF THE ENVIRONMENT IN WARTIME
  Wanton destruction of the environment is prohibited.
  Specific Prohibition
  The poisoning of the water supply is prohibited under all circumstances (HR art. 23(a)).