Section 695(1) in Police Regulations, Bengal , 1943
(1)For each sentry posted, there must be specific orders by the Superintendent defining (i) the sentry's beat and front, (ii) the position of the guard when it is required to fall in and (iii) the distance at which intruders are to be challenged.NOTE. - Where the guard room is at some distance from the sentry's beat the Superintendent shall arrange for a separate sentry over the guard.