Section 161A(a) in Police Regulations, Bengal , 1943
(a)The Superintendent shall then detail a police party of the strength and composition shown below to meet the troops as they enter the district and to remain with them until they leave the district or until the party is relieved by a similar police party from the next district on the line of march. The Superintendent shall furnish the officer in command of the party with an official letter of introduction to the officer commanding the troops, to which shall be attached a copy of clause (e).
