Book excerpt: Bohdan Hryniewicz was only 8 when war broke out and 13 when it ended. In those years he saw more than most men would in 10 lifetimes; and his recall is extraordinary. He cites three days as defining this period: the saddest, 19 September 1939 as Russian tanks rolled into his home town of Wilno; the happiest, August 1 1944, when the Polish flag flew once again from the highest building in Warsaw; the most bitter, October 3 that year, when his commanding officer forbade him to join the other members of his battalion as they entered a prisoner of war camp. His story is uniquely personal and at the same time tells the wider story of a pivotal battle that was virtually unheard of until the fall of communism.