The victory of the Rebel Alliance in Yavin was a completely unexpected surprise. But the destruction of the Death Star did not change the story of the Galactic Civil War: The Empire's numerical and technological superiority over the rebels was overwhelming. In the aftermath of the Battle of Yavin, this entire Imperial machine was deployed to flush out the rebels and eliminate them.
The book states that an All Terrain Armored Transport was 26 meters long and 22 meters tall. However, Star Wars: Rogue One: AT-ACT Deluxe Book and 3D Wood Model had previously given the length as twenty meters, and the vehicle's entry in the Encyclopedia had given the height as 22.5 meters.