um, yes the did, the amount of soldiers freezing to death in a country I won't name because it could cause a political fight right now is a very good example of how much mud, snow, cold and no way to dry offclothing are taking lives right now
soldiers froze to death regularly in WW2, they just found some frozen corpses I think in northern italy from WW2
they all had heat sources on artic trips and when that fuel ended, they died.
Even the Inuit had heat sources in their igloos (which were only temporary winter homes). they lit blubber candles in shells and with that and their body heat, were able to be somewhat comfortable. I have no personal experience in this but have read about it