The long walk by Slavomir Rawicz
I looked this book up after seeing a trailer for the film which was made recently. It is a tale of a man suffering through horrendous conditions and showing what the human spirit is capable of. The men of yesteryear were a hell of a lot harder than us wimps. There is lots of bushcraft and survival tips in it too. Breaking through a frozen river to catch the fish and using an axe and a homemade knife for everything. death, life and everthing in between. Could you march 1000miles over several months on 100g of bread and 2 cups of coffee a day?
Overall a very very good book.
Check it out if you need something to read.
The Long Walk: The True Story of a Trek to Freedom