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Second Battle of Ypres
During World War I, the Second Battle of Ypres was fought from 22 April – 25 May 1915 for control of the strategic Flemish town of Ypres in western Belgium. The First Battle of Ypres had been fought the previous autumn. The Second Battle of Ypres was the first mass use by Germany of poison gas on the Western Front. It also marked the first time a former colonial force (the 1st Canadian Division) defeated a European power (the German Empire) in Europe (at the Battle of St. Julien and Battle of Kitcheners' Wood). The eminent German chemist Walther Nernst, who was in the army in 1914 as a volunteer driver, saw how trenches produced deadlock. He proposed to Colonel Max Bauer, the German general staff officer responsible for liaison with scientists, that they could empty the opposing trenches by a surprise attack with tear gas. Observing a field test of this idea, the chemist Fritz Haber instead proposed using heavier than air chlorine gas (originally preferring the use of the more deadly phosgene gas, though little was stockpiled for such a use).
The German commander Erich von Falkenhayn agreed to try the new weapon, but intended to use it in a diversionary attack by his 4th Army. The gas would be released by siphoning liquid chlorine out of cylinders; the gas could not be released directly because the valves would freeze; wind would carry the gas to the enemy lines. 5,730 gas cylinders, the larger weighing 90 pounds (41 kg) each, were manhandled into the front line. Installation was supervised by Haber and the other future Nobel prize winners Otto Hahn, James Franck and Gustav Hertz. Twice cylinders were breached by shell fire, the second time three men were killed and fifty wounded. Some of the Germans were protected by miner's oxygen breathing apparatus.
The Ypres salient was the selected for the attack. It followed the canal, bulging eastward around the town. North of the salient, the Belgian army held the line of the Yser and the north end of the salient was held by two French divisions. The eastern part of the salient was defended by the Canadian and two British divisions. The II Corps and V Corps of the Second Army comprised the 1st, 2nd and 3rd Cavalry Divisions and the 4th, 27th, 28th, Northumbrian, Lahore and 1st Canadian divisions.
Second Battle of Ypres 第二次イーペルの戦い