He caused sentries to be posted by day facing inwards along the place where
						the arms were kept, for the object of these is to keep an eye not on the
						enemy but on their friends. The enemy is watched by cavalry from positions
						that command the widest outlook. To meet the case of a hostile approach at night, he assigned the duty of
						acting as sentries outside the lines to the Sciritae. In these days the duty
						is shared by foreigners, if any happen to be present in the camp.