'Letter to Sarah Ballou' was the last letter by the union soldier Sullivan Ballou. Sullivan thought he did not lead a good life as he was not there with his wife, Sarah.
Sullivan Ballou was an attorney in Rhode Island and later enlisted as a soldier. He wrote this last letter to his wife, Sarah as he knew that he won't be able to survive the battle and will die.
He in his last time wants to apologize to Sarah for not fulfilling his duty as a husband and for the pain he has inflicted on her. He wrote this letter before the Battle of Bull Run.
Therefore, it seems that he has some regrets about living his life.
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