Related Rule
Greece
Practice Relating to Rule 57. Ruses of War
The Hellenic Navy’s International Law Manual (1995) provides:
[S]ome ruses of war in the course of hostilities which serve the purpose of disorienting the adversary without inducing him, do not constitute perfidy and therefore are permissible. Camouflage, decoys, mock operations and disinformation may serve as paradigms of permissible acts. 
Greece, International Law Manual, Hellenic Navy General Staff, Directorate A2, Division IV, 1995, Chapter 5, § 5.