Cocoa Joy was amazed at the remains of a tunnel dug by Union Soldiers as they tried to dig their way into the middle of the earthworks of Confederate troops at Cheatham Hill—a major battlefield at Kennesaw Mountain. Someone had a pair of strong paws! The tunnel only goes back a few feet, but it demonstrates the tenacious attitude of a group of desperate Federal troops. Georgia red clay can be as hard as stone. The Park Service fortified the entrance of the tunnel to prevent its collapse. (See more photos: Training Up Cocoa)