KnowraSecond Battle of YpresLinked fromLinked fromThe 8 pages that link to Second Battle of Ypres, each with the reason it gives.All 8Broader topic 4Related 4Chemical warfareBroader topic: The attack became a pivotal early instance of large-scale chemical warfare.Chemical warfare agentBroader topic: The attack marked a major early use of chemical agents in World War I.Mustard gasBroader topic: It provides context for the earlier chemical warfare that preceded mustard's battlefield debut.Chemical weapons in World War IBroader topic: The attack made chemical warfare a major feature of the Western Front.