WW1. Amputation by razor.
I've just watched a show on Foxtel called ANZAC Battlefields - The Western Front. It's been a high quality series.
Anyway, the host, Neil Piggott was reading from a WW1 diary where a medic said that the had to amputate an arm at the shoulder and a leg at the thigh using nothing more than a razor. You'd want to hope that it was a bloody huge Wade and Butcher to have to do something like that with it. The thought of having to cut through tendons and cartilage with a razor is pretty grim.