...ey may do so either in line or in column. While firing, the guns are distant from each other from 25 to 30 or 10 to 12 yards; the latter interval is used when we wish to concentrate the fire. Batt eries have not yet been arranged in columns for firing; this may perhaps be done with rifled guns, which fire at great distances, and with which we may fire over our own troops or artillery in first l...