In late September, Pershing led the AEF during the final Meuse-Argonne Offensive which broke the German lines and led to the end of the war on November 11. By war's end, Pershing's command had grown to 1.8 million men.
Dimensions of Castle Walls: the height and thickness of castle walls varied from castle to castle but typically they ranged from between seven to thirty feet in thickness and typically thirty to forty feet in height. The illustration below is a cutaway view of how a typical castle wall is constructed.
On top of the stone retaining wall, stood another wall made of mud-bricks, 6 feet (2m) thick, and 20 to 26 feet (6-8m) high. Together these two walls combined to form a fortification 32 to 41 feet high. To put this into perspective, envision a 4 story tall building. Such was the height of the walls of Jericho.