The Second Battle of Ypres was a major battle during World War I that took place in Belgium in 1915. It is notable for being the first time Germany used poison gas on a large scale on the Western Front.
Trench Warfare: A type of combat in which opposing troops fight from trenches facing each other. This was a common form of warfare during World War I.
Western Front: The main theatre of war during World War I, stretching across Belgium and France. It was marked by trench warfare and massive casualties.
Chemical Warfare: The use of toxic chemical substances as weapons or tactics of war. Poison gas, introduced at Ypres, is an example.
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