...lling over the land from the east, reached the meridian of Chiekamauga, they were made dissonant by the murderous roar of the artillery of Bishop Polk, who was opening the battle on Thomas's front. Granger , who had been ordered at all hazards to hold fast where he was, listened and grew impatient. Shortly before 10 o'clock, calling my attention to a great column of dust moving from our front toward t...