...arder service than this battalion during the last year. Coming here is almost like entering a new world. News reaches us of the operations of our armies in the east, in Tennessee and along the Mississippi River , of not more than two days old. We have just heard of the great battle of Gettysburg, in Pennsylvania, on the 1st, 2d and 3d instant, and the defeat of the rebel army under General Lee; and of the ca...