Upvote:3
This is about the battle of Chickamauga. This battle is a defeat of the Union but apparently the author wants to show that Forrest was not at all the guy who made it a Confederacy victory.
During the battle of Chickamauga, the Confederates had to fight head on Union forces and failed to outmaneuver them. They won only because there was a bad movement from the Union that led them to open their positions, and the infantry used it.
During this battle, this would have been Nathan Forrest role to prevent the Union to move their units too easily, and his role as well to recon their positions and capture some good positions prior to the Confederacy infantry attacks. The author, in the extract you wrote, explains how Forrest failed to achieve those missions.
So: