It may appear from a fieldpost letter of Major Karl von Zingler that the first chlorine gas attack by German forces took place before 2 January 1915: "In other war theatres it does not go better and it has been said that our Chlorine is very effective.
Enligt ett brev från major Karl von Zingler inträffade den första klorattacken av tysk militär före 5 januari 1915: "In other war theaters it does not go better and it has been said that our Chlorine is very effective.