Related Rule
Greece
Practice Relating to Rule 15. The Principle of Precautions in Attack
The Hellenic Navy’s International Law Manual (1995) provides: “Means and methods employed in the particular naval operation should be of such nature so as not to inflict damages to non-military targets or restrict collateral damages to the lowest possible level.” 
Greece, International Law Manual, Hellenic Navy General Staff, Directorate A2, Division IV, 1995, Chapter 7, Part I, § 2(b).