...hich are to be deducted the losses in action, &c.; but as the return for July 10th showed 11,842 for duty in that arm at that date, it must have numbered considerably more than 12,000 for duty at Gettysburg . The brigade of regular batteries, out of an aggregate of 595, must have numbered at least 500 for duty according to the ratio in the other artillery, and that ought to be added to the present for ...