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Peru
Practice Relating to Rule 57. Ruses of War
Peru’s IHL Manual (2004) states:
(1) In order to fulfil their mission, commanders [may] attempt to mislead the enemy about their intentions and actions or conceal them to induce him to act recklessly. For this to be compatible with the law of armed conflict, a distinction must be made between ruses of war (permitted) and perfidy (prohibited).
(2) Ruses of war are acts that are not perfidious, but which are intended to:
(a) mislead the enemy into making mistakes;
(b) induce the enemy to act recklessly.
(3) Ruses of war are permitted. Examples include:
(a) camouflage (natural, paint, nets, smoke);
(b) decoys and pretence;
(c) mock operations;
(d) misinformation;
(e) technological ruses (electronics, communications). 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 27.e.(1)–(3).
In the context of armed conflict at sea, the manual states: “Ruses of war are permitted. Warships and auxiliary vessels, however, are prohibited from launching an attack whilst flying a false flag, and at all times from actively simulating the status of [those vessels exempt from attack].” 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 135.b.
In the context of air warfare, the manual states:
Stratagems are legal at all times.
Deceiving the enemy by camouflaging air bases, simulating traces, misleading by electronic means or even using the enemy’s SIF (Selective Identification Feature) or IFF (Identification Friend or Foe) to penetrate its air defence system are perfectly legal aerial tactics or methods. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 165.a.
Peru’s IHL and Human Rights Manual (2010) states in its Glossary of Terms:
Ruses of war … [a]re acts whose objective is to mislead the enemy and to induce him to act recklessly but which do not violate any norm of international law and which are not perfidious because they do not appeal to the adversary’s good faith regarding the protection afforded by international law. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, p. 404.
The manual further states:
(1) In order to fulfil their mission, commanders [may] attempt to mislead the enemy about their intentions and actions or conceal them to induce him to act recklessly. For this to be compatible with international humanitarian law, a distinction must be made between ruses of war (permitted) and perfidy (prohibited).
(2) “Ruses of war” are acts that are not perfidious, but which are intended to:
(a) mislead the enemy into making mistakes;
(b) induce the enemy to act recklessly.
(3) Ruses of war are permitted. Examples include:
(a) camouflage (natural, paint, nets, smoke);
(b) decoys and pretence;
(c) mock operations;
(d) misinformation, false data;
(e) technological ruses (electronics, communications). 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 28(e), p. 238; see also § 46, p. 423.
The manual also states: “Ruses of war are permitted. Warships and auxiliary vessels, however, are prohibited from launching an attack whilst flying a false flag, and at all times from intentionally simulating the status of [those vessels exempt from attack].” 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 126(b), p. 238.
The manual further states:
Stratagems are legal at all times.
Deceiving the enemy by camouflaging air bases, simulating traces, misleading by electronic means or even using the enemy’s SIF (Selective Identification Feature) or IFF (Identification Friend or Foe) to penetrate its air defence system are perfectly legal aerial tactics or methods. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 166(a), p. 339.