On September 28, 1863, the Galveston Tri-Weekly News caught its readers' attention with an item headlined "A Yankee Note-Book." It was the first installment of a diary confiscated from U.S. Marine Henry O. Gusley, who had been captured at the Battle of Sabine Pass. Gusley's diary proved so popular with readers that they clamored for more, causing the newspaper to run each excerpt twice until the whole diary was published. For many in Gusley's Confederate readership, his diary provided a rare glimpse into the opinions and feelings of an ordinary Yankee--an enemy whom, they...