What does a father write to his wife and young children when he's gone to war? Does he explain why he left them? How does he answer their constant questions about his return? Which of his experiences does he relate, and which does he pass over? Should he describe his feelings of separation and loneliness? These questions are as relevant today as they were over 150 years ago, when David Brainard Griffin, a corporal in Company F of the 2nd Minnesota Regiment of Volunteers, wrote to those he left behind on the family's Minnesota prairie homestead while he fought to preserve the Union. His...