Statistics for occurrence #1 of “Baton Rouge, Louisiana” in chapter 4, page 43 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

... Baton Rouge, Louisiana
The First Wisconsin Independent Battery of Light Artillery saw most of its service in Tennessee, Mississippi, and Louisiana...
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