OK, here's the specifics. 8 PM, June 7, 1865, Yankee troops arrived in Shreveport. Source, New York Times article of July 9, 1865.
http://www.nytimes.com/1865/07/09/news/louisiana-up-red-river-shreveport-la-its-occupation-our-forces-condition.html?pagewanted=1