Соответствующая норма
Croatia
Practice Relating to Rule 14. Proportionality in Attack
Croatia’s LOAC Compendium (1991) considers a military action to be proportionate “when it does not cause collateral civilian casualties and excessive damage in relation to the expected military advantage of the operation”. 
Croatia, Compendium “Law of Armed Conflicts”, Republic of Croatia, Ministry of Defence, 1991, p. 38.