The rapid development of field post offices necessitated the appointment of a second Superintendent, and Mr. A. Bean was deputed to field service. On the 6th January, 1904, Mr. Bean took over charge of the Base Division, but shortly after died of heart disease on the 3rd March, 1904. The entire arrangements then devolved again on Mr. Tulloch until the 1st April, 1904, when Mr. C. J. Dease took over charge of the Base Division.
The Mission advanced on Gyantse on the 4th April. From Tuna to Gyantse the mail arrangements were in the hands of the military authorities, and only one postal clerk, whose duty it was to distribute letters, was sent up with the escort. The Mission reached Gyantse on the 14th May, and a field post office had to be opened there and at several other places on the lines of communications. The force remained at Lhassa from the 3rd August to the 23rd September and returned to Gyantse on the 6th October, 1904. There was by this time at Gyantse an accumulation of over 1100 parcels addressed to the members of the Lhassa column, but Mr. Angelo, who was then placed in charge of the advance division, disposed of them in three days before the troops left on their return march. The demobilization of the force began by the end of October, and the postal officials were ordered to leave Chumbi on the 26th and to close the field post offices between Chumbi and Gangtok on their way down. Mr. Tulloch relinquished charge of the F.P.O.'s on the 28th November, 1904.
The postal arrangements made to serve the Bazar Valley Field Force extended over a period of twenty-five days, from the 13th February to the 8th March, 1908. On the night of the 12th February the Chief of the Staff informed the Postmaster, Peshawar, that the force would leave the station the next morning. A base office, four first-class field post offices and three second-class field post offices were sent to the front, and on receipt of the scheme for the organization and mobilization of the force on the 14th February this establishment was reduced considerably. The work of the field post offices on this occasion was limited almost entirely to the disposal of articles of the letter and packet mails.
The postal arrangements made to serve the Mohmand Field Force extended over a period of thirty-eight days, from the 28th April to the 4th June, 1908. The first intimation that an expedition would take place was received on the 23rd April, and the Postmaster-General, Punjab and N.-W.F., was at once directed to make all arrangements to serve the troops that were concentrating on the frontier. Mr. McMinn, who was Chief Superintendent of post offices with the Bazar Valley Field Force, was placed in charge.