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While the Battle of Messines was an important allied victory, the detonation was said to be the deadliest non-nuclear man-made explosion, with 10,000 lives lost. The battle claimed 317 casualties from the 40th Battalion alone. Among them was Private Marcus Brown.
https://www.libraries.tas.gov.au/ww1/Pages/Brown.aspx
https://en.wikipedia.org/wiki/Battle_of_Messines_(1917)
https://www.awm.gov.au/collection/U51480/
http://shapingtasmania.tmag.tas.gov.au/object.aspx?ID=42