In December 1914 he was appointed to the Committee on Alleged German Outrages, which in May 1915 reported on German war crimes against civilians during the invasion of Belgium in the opening months of World War I.
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His elder brothers included the noted physicist and engineer John Hopkinson, and Sir Alfred Hopkinson, vice-chancellor of the University of Manchester, and amongst his nephews were engineer and scientist Bertram Hopkinson, and Austin Hopkinson, MP.