Related Rule
Peru
Practice Relating to Rule 15. The Principle of Precautions in Attack
Section C. Feasibility of precautions in attack
Peru’s IHL Manual (2004) states:
Those responsible for planning or deciding upon attacks must:
(1) do all that is feasible to verify that the designated target is in fact a military objective;
(2) take all feasible precautions when choosing the tactics and weapons to be used to avoid or, at least, minimize incidental loss of civilian life, injury to civilians and damage to civilian objects. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 29.b.(1) and (2).
Peru’s IHL and Human Rights Manual (2010) states:
Those responsible for planning or deciding upon attacks must:
(1) Do all that is feasible to verify that the designated target is in fact a military objective.
(2) Take all feasible precautions in the selection of weapons and tactics in order to avoid or at any rate minimize the number of deaths and injuries amongst the civilian population and damage to civilian objects. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 30(b)(1)–(2), p. 242.