I came across this fascinating diary, of a man named Alvin C. York, a soldier in World War I. He was a Christian, and gives God all the glory. It is a long read, but it is worth the time! Alvin York had the equivalent of a third grade education, as shown by his grammar and spelling.
For a shorter account, you can read Wikipedia's version here.
When I was little, my parents got a Christian periodical which published Alvin York's story in one of their issues. His story impressed me then, as it still does today!