There is no doubt that this letter is one of the most heartbreaking ones I have ever read from the Civil War era. On October 17 and 18, 1862, from the cells of the Palmyra Prison, Captain Thomas A. Sidner of the First Northeast Missouri Cavalry penned a letter to his friends and family, notifying them of his pending execution. In command of the District of Northeast Missouri, Col. John McNeil sentenced to death ten random Confederate prisoners from the Palmyra Prison in retaliation for the supposed murder of a local Union sympathizer. With no ties to the murder, Sidner was told that he was to be executed the next day for a crime he was not guilty of. Later known as the Palmyra Massacre, this act became one of the most infamous war crimes of the entire Civil War.