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Related Rule
Mexico
Practice Relating to Rule 65. Perfidy
Section A. General
III. Military Manuals
Mexico’s Army and Air Force Manual (2009) states:
The underlying idea of this body of law [i.e. IHL] is to humanize war. The three main principles established to this end are:
…
C. means of warfare involving perfidy, that is, those that are contrary to military honour, are prohibited. 
Mexico, Manual de Derecho Internacional Humanitario para el Ejército y la Fuerza Área Mexicanos, Ministry of National Defence, June 2009, § 372(C).
The manual also states: “It is prohibited to: … kill or wound by means of treachery.” 
Mexico, Manual de Derecho Internacional Humanitario para el Ejército y la Fuerza Área Mexicanos, Ministry of National Defence, June 2009, § 389(A).