Related Rule
Argentina
Practice Relating to Rule 1. The Principle of Distinction between Civilians and Combatants
Argentina’s Law of War Manual (1989) provides: “The parties to the conflict must distinguish at all times between the [civilian] population and combatants.” 
Argentina, Leyes de Guerra, PC-08-01, Público, Edición 1989, Estado Mayor Conjunto de las Fuerzas Armadas, aprobado por Resolución No. 489/89 del Ministerio de Defensa, 23 April 1990, § 4.01.
Argentina’s Law of War Manual (1989) states: “The prohibition to attack civilians and civilian objects implies that any act of violence, whether in offence or defence, against them is prohibited”. 
Argentina, Leyes de Guerra, PC-08-01, Público, Edición 1989, Estado Mayor Conjunto de las Fuerzas Armadas, aprobado por Resolución No. 489/89 del Ministerio de Defensa, 23 April 1990, § 4.03.
With respect to non-international armed conflicts in particular, the manual states: “The civilian population and individual civilians shall not be the object of attack.” 
Argentina, Leyes de Guerra, PC-08-01, Público, Edición 1989, Estado Mayor Conjunto de las Fuerzas Armadas, aprobado por Resolución No. 489/89 del Ministerio de Defensa, 23 April 1990, § 7.08.
The manual further states that “attacks against the civilian population [and] against individual civilians” constitute grave breaches. 
Argentina, Leyes de Guerra, PC-08-01, Público, Edición 1989, Estado Mayor Conjunto de las Fuerzas Armadas, aprobado por Resolución No. 489/89 del Ministerio de Defensa, 23 April 1990, § 8.03.