Final answer:
The question does not provide enough information to determine the number of miles the prisoners walked in the snow.
Step-by-step explanation:
The question does not provide enough information to accurately determine the number of miles the prisoners walked in the snow. It could be referring to various historical events such as the Bataan Death March during World War II, the forced marches of prisoners during the Holocaust, or the experiences of prisoners in Civil War camps. Each of these events would have different distances and circumstances.