In 1918 Lieutenant Kilman was sent to take control of the field post offices attached to the East Persian Cordon between Meshed and Dalbandin. The East Persian Cordon was subsequently known as the Force in East Persia, and the postal organization consisted of 1 Base post office and 13 field post offices, with a staff of an Assistant Director of Posts and Telegraphs, 1 inspector, 1 base postmaster, 13 field postmasters, 31 clerks and 54 menials.
A field post office contingent was also sent to Bushire in 1918 in connection with the operations between Bushire and Shiraz. This was placed under the control of Mr. C. F. Quilter as Assistant Director, who was also given control of the postal arrangements of the British Mission Escort in South Persia operating from Bunder-Abbas to Kerman and Shiraz. The British Mission Escort commenced its operations early in 1916 and its postal arrangements were in charge of Captain Greene, R. E., Superintendent of post offices, prior to their being taken over by Mr. Quilter. Up to March, 1919, the postal organization of the Bushire Force and British Mission Escort consisted of 2 Base post offices and 18 field post offices, with a staff of an Assistant Director, a Deputy Assistant Director, 2 inspectors, 2 base postmasters, 18 field postmasters, 49 clerks and 86 menials. From April, 1919, the Force was considerably reduced and a large portion of the field postal staff was withdrawn.
The operations in the neighbourhood of Aden led to the establishment of a few field post offices under the postmaster of Aden, who carried out this work in addition to his own.
The total number of officials of the Indian field post offices serving with the various Expeditionary Forces in 1918 was about two thousand, and with this large contingent serving abroad the Department in India had to undertake the difficult task of equipping and despatching regular reinforcements to the several theatres of war. In order to deal with the enormous quantity of Army mails, both originating in India and received from abroad, two special base offices were established, one at Bombay and one at Karachi. The Base Office in Bombay was converted in 1918 into a Base Postal Depot, and in addition to dealing with the mails for the troops it was also assigned the duty of recruitment and mobilization of postal reinforcements. The establishment of the Base Postal Depot in Bombay solved many of the difficulties which attended the organization of field post offices and the disposal of mails for armies in the field. The depot was divided into four main sections for Enquiry, Sorting, Mobilization and Correspondence. The chief duty of the Enquiry section was to ensure the correct delivery of correspondence for the troops that had returned or had been invalided from the field. This section was in charge of a lady Superintendent with forty lady clerks, and their duty was to keep up to date a regular record giving the names, designations and addresses of officers and men who had returned to India. The Enquiry section kept its records by means of index cards, of which there were over 133,000 when the armistice was declared. About 330,000 letters monthly were disposed of in this section.
In the Sorting section the average number of postal articles dealt with in a month was about one million. The sorting of mails for all the forces was done by units, separate bundles or packets being prepared for the officers and men with each unit. These mails were then forwarded ready sorted to the base offices at the various fronts, where they were distributed to the field offices serving the units in question.
The Mobilization section dealt with all matters relating to the mobilization of the staff recruited in India for service overseas. Only men who had volunteered for field service were taken, and on receiving orders these men reported themselves to the Officer Commanding, Base Postal Depot, Bombay, who arranged for their kit, uniform and transport to the force for which they were detailed. The Correspondence section dealt with all complaints regarding postal articles for the field forces, and, by being in close connection with the Enquiry branch, it was able to dispose of a large number of complaints without delay.
The Base Postal Depot, Bombay, was thus the most essential factor in the whole postal organization, and the smooth working of mail arrangements for the Expeditionary Forces depended very largely upon its efficiency. The Depot was directly under the control of the Director-General of Posts and Telegraphs and in charge of Captain Love, a pensioned officer of the Department, who had retired as Presidency Postmaster, Bombay.
To reward the good work done by the Indian postal staff in the field, no less than fifty-two personal distinctions were granted and over three hundred men were mentioned in despatches. The Department may well be proud of its achievements during the war. Volunteers were always ready to come forward for service in the worst places and many lost their lives. The best proof of their work, however, is the high reputation which the Post Office of India has earned among all branches of the Army.