The "Lydda Death March" the death toll was around 1/2 of 1% and 17 kilometres.  People died of dehydration, thirst, hunger and even disease! according to Morris.  (Not to make light of it, I have hiked 10 miles in the desert in the heat without sufficient water and no food; and while no picnic, it was hardly a "death march")  The Bataan Death March, for example, was 90 kilometres the death toll was between 25 and 28% and included cutting the throats of stragglers.  There is about one presumably reputable historian (the Oxford Companion reference) who refers to it that way.