Etowah Bridge, Saturday, Aug. 20. We were up in time to see an expedition start down the river, consisting of 900 cavalry and three regiments of infantry. They laid under arms all night, and were going to ascertain if there was any force in this vicinity. Infantry returned in six hours. Cavalry went. Lieutenant Clark went out scouting with armed squad. Twenty-six guerrillas and conscripters are all he can hear of. Brigade of troops from Rome arrived yesterday but returned immediately not needed. Went to town after being relieved from guard. Back mail gone to the front.