TIL my great-grandfather's WW1 unit had a 36% casualty rate and was nicknamed "the Suicide Club": https://au.forceswarrecords.com/unit/134412/machine-gun-corps
[He served at Gallipoli, a fact that often surprises my Australian and Kiwi friends who were brought up with the incorrect notion that Gallipoli was exclusively an ANZAC show - actually there were about 7x as many British troops in theatre, but the ANZACs suffered much heavier proportional losses.]
Relatedly, I've met Canadians who were surprised I didn't know about the role Canadian forces played at the various battles of Ypres. Canadian forces suffered devastating losses there, particularly in the Second Battle, so it looms large in Canadian WW1 folklore; but they were a small percentage of the overall Allied losses.