February 28 – WWI: Canadian troops launch the first trench raid of the war; by the end of the conflict Canadian troops will be regarded as the experts at this manoeuvre
April 22 – WWI: In the Second Battle of Ypres Canadian forces bear the brunt of the first large-scale chemical weapons attack on the Western Front. They devise makeshift gas masks of urine-soaked rags and hold their ground
December 19 – WW1: Captain M.M. Bell-Irving, No.1 Squadron, Royal Flying Corps, achieves the first aerial victory by a Canadian when he shot down a German aircraft
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