Related Rule
Ireland
Practice Relating to Rule 15. The Principle of Precautions in Attack
Section C. Feasibility of precautions in attack
Upon ratification of the 1977 Additional Protocol I, Ireland stated: “The word ‘feasible’ means that which is practicable or practically possible, taking into account all circumstances at the time, including humanitarian and military considerations.” 
Ireland, Declarations and reservations made upon ratification of the 1977 Additional Protocol I, 19 May 1999, § 6.