Possible Turning Points of the War, history homework help

The year 1863 marked a shift in the Civil War, paving the way for Union victories and Confederate defeats. Three major battles influenced this shift: Gettysburg, Vicksburg, and Chattanooga. Before beginning this discussion, make sure to read about the battles in the textbook, and view the film Battle of Chattanooga. Compare and contrast each battle, considering the political and military impact of each on the Union and Confederacy. Consider the following in a post of at least 250 words: Of Gettysburg, Vicksburg, or Chattanooga, which do you believe was more of a “turning point” in the war and why?A minimum of 1 reference is required.