Related Rule
Peru
Practice Relating to Rule 153. Command Responsibility for Failure to Prevent, Punish or Report War Crimes
Peru’s Human Rights Charter of the Security Forces (1991) provides: “All alleged violations must immediately be reported to the superior.” 
Peru, Derechos Humanos: Decálogo de las Fuerzas del Orden, Comando Conjunto de las Fuerzas Armadas, Ministerio de Defensa, Ejército Peruano, 1991, p. 21.
Peru’s IHL Manual (2004) states:
The commander of the theatre of operations assumes and bears overall responsibility for ensuring strict compliance with international humanitarian law. Respect for international humanitarian law is a matter of order and discipline, and this must be taken into account when formulating plans and operational directives. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 24.a.(1).
The manual also states:
In the event of violations of international humanitarian law, commanders must ensure that:
(a) violations cease and appropriate measures are taken to ensure that they do not occur in the future;
(b) disciplinary or criminal action is taken against those responsible for the violations.
It should be understood that, ultimately, responsibility is incurred when violations of international humanitarian law are committed as the result of a failure to act when there is a duty to act. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 24.b.(2).
The manual further states:
Report acts or facts that constitute war crimes and enforce criminal and disciplinary responsibility for such crimes committed by superiors and subordinates, applying article 87 of Protocol I additional to the Geneva Conventions. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 10.c.(2).
Peru’s IHL and Human Rights Manual (2010) states: “The commander must personally make sure that his subordinates know the obligations stemming from international humanitarian law and that they respect them.” 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 19, p. 419.
The manual also states:
The commander of the theatre of operations assumes and bears overall responsibility for ensuring strict compliance with international humanitarian law. Respect for international humanitarian law is a matter of order and discipline, and this must be taken into account when formulating plans and operational directives. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 25(a)(1), p. 225–226.
The manual further states:
In the event of violations of international humanitarian law, commanders must ensure that:
(a) violations cease and appropriate measures are taken to ensure that they do not occur in the future;
(b) disciplinary or criminal action is taken against those responsible for the violations.
It should be understood that, ultimately, responsibility is incurred when violations of international humanitarian law are committed as the result of a failure to act when there is a duty to act. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 25(b)(2), pp. 227–228.
The manual also states:
Report acts or facts that constitute war crimes and enforce criminal and disciplinary responsibility for such crimes committed by superiors and subordinates, applying article 87 of [the 1977 Additional] Protocol I additional to the [1949] Geneva Conventions. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 10(c)(1), p. 222.
Peru’s Code of Military and Police Justice (2006) states:
A military commander or person effectively acting as a military commander who commits a crime described in the present Title [of this law] shall be subjected to the same penalty as the one applicable to those under his or her command or effective authority and control provided that:
This person knew that his or her subordinates were committing or were about to commit such crimes; and
He or she failed to take all necessary and reasonable measures within his or her power to prevent or repress their commission or to submit the matter to the competent authorities for investigation and prosecution. 
Peru, Code of Military and Police Justice, 2006, Article 84.
Peru’s Decree on the Use of Force by the Armed Forces (2010) states:
The superior is responsible for violations of the present Legislative Decree and its Regulations [which set forth IHL obligations] if the superior knew that his or her subordinates committed such violations and if the superior failed to take the adequate available measures to prevent or punish the violations. 
Peru, Decree on the Use of Force by the Armed Forces, 2010, Article 29.
Peru’s Military and Police Criminal Code (2010) states:
In cases concerning crimes against International Humanitarian Law, the punishment shall be lessened for individuals who carried out an order by a government, authority or superior, whether civilian or military, as long as:
a. The perpetrator did not know that the order was unlawful; and
b. The order was not manifestly unlawful. 
Peru, Military and Police Criminal Code, 2010, Article 77.