Glenbrook Tunnel War One. The first was Chlorine gas which was introduced by the Germans at the Second battle of Ypres in April 1915. This was followed by the use of Phosphene Gas, also introduced by the Germans. These attacked victims' respiratory organs causing coughing and choking. The Germans used Mustard Gas, a more advanced gas, for the first time at Riga (or Yperite) in September 1917. It caused both internal and external blistering in its victims. The blistering was often delayed and remained in the ground for weeks afterwards making capture of infected trenches dangerous. Protection against mustard gas was far
3rd Army (German Empire) May 1917. Einem's right wing units would also participate in Erich Ludendorff's Champagne-Marne offensive on 15–17 July 1918 supporting the east flank of the German 1st Army. After suffering severe casualties in battle with John J. Pershing's Allied Expeditionary Force from 26 September – 11 November in the Meuse-Argonne offensive, the army was forced to retreat northward shortly before the war's end. At the end of the war it was serving as part of "Heeresgruppe Deutscher Kronprinz". By the end of the war, the 3rd Army was organised as: The 3rd Army had the following commanders during its existence: 3rd