:) Hints are good, but if we cant use google to help, they are possibly not quite good enough.
In the back of my befuddled brain there is a book set in the Russian Revolution that has possibly got "Don" in the title, but I would have to cheat to find it I can picture the cover, with a Revolutionary soldier on it. I think it was ? ? Flows the Don. I would be guessing at the first two words, and I can't guarantee the correctness of the other three either