Vim praefecturae modicam antea intendit, dispersas per urbem cohortis una in castra conducendo, ut simul imperia acciperent numeroque et robore et visu inter se fiducia ipsis, in ceteros metus oreretur.
Translation :
He strengthened the hitherto moderate powers of his office by concentrating the cohorts scattered throughout the capital into one camp, so that they might all receive orders
at the same moment, and that the sight of their numbers and strength might give confidence to themselves, while it would strike terror into the citizens.
Edition :
Annales ab excessu divi Augusti. Cornelius Tacitus. Charles Dennis Fisher. Clarendon Press. Oxford. 1906.
Complete Works of Tacitus. Tacitus. Alfred John Church. William Jackson Brodribb. Sara Bryant. edited for Perseus. New York. : Random House, Inc. Random House, Inc. reprinted 1942.