Shadow in the Valley (2010)

An impressive and epic commemoration of the 145th anniversary of the Battle of Chickamauga, tells the story of the pivotal 1863 battle in the western theater from the common soldier's point of view. This battle was the most significant Union defeat in the Western Theater, and fought with the second highest number of casualties in the war after Gettysburg. Generals Rosecrans and Bragg locked in a fight to the death.

Unfortunately the movie Shadow in the Valley is not yet available on HBO Max.