The orders for the despatch of a force for operations in Sikkim were notified in the _Gazette of India_ of the 3rd March, 1888. Shortly after the commencement of hostilities the Government of Bengal requested Mr. H. M. Kisch, Postmaster-General, Bengal, to open a runners' line from Siliguri to Kalimpong, a distance of thirty-seven miles. This line was used only for transmission of letter mails, parcel mails being conveyed by the old route from Darjeeling via Ghum and Pasok. On the 24th March the Padong post office was converted into a sub-office, and from that date it was constituted a Base office for the expedition. On the 16th March the force, which concentrated at Padong, moved out in two columns, one under Brigadier-General T. Graham, R.A., commanding the expedition, and the other under Colonel Michel, of the 13th Bengal Infantry, the former advancing towards Fort Lingtu and the other towards the Rhenok Bazar. With the advance of troops the post office opened at Dulapchin was shortly removed to Ranglichu. Other post offices were opened at Gnatong, Sedonchin, Gangtok, Rhenok Bazar and Pakyong. The mail lines connecting these offices were under the management of the Post Office as far as Ronglichu and Pakyong, but the lines beyond were under the Political authorities. _The Black Mountain or Hazara Field Force._ Towards the beginning of September, 1888, the Home Government having decided to send a punitive expedition against the tribesmen of the Black Mountain, a Field Force was organized on the Hazara frontier. The object of the expedition was to punish the Khan Khel Hassanzai and the Akazai tribes. Brigadier-General J. W. McQueen, C.B., Commanding the Punjab Frontier Force, directed the expedition. On the 8th September, 1888, Mr. W. T. van Someren, Superintendent of post offices, Rawalpindi Division, was deputed to make the postal arrangements with the force. Haripur was constituted a Base office for the Derband column, and Abbottabad for the Oghi column. The tonga service from Hassan Abdal to Abbottabad was strengthened and extended to Mansera, and a mixed tonga and horse service was established between Abbottabad and Oghi. A runners' line was opened from Haripur to Derband. A railway sorting office, under the supervision of Mr. N. G. Wait, was also opened at Hassan Abdal for the sorting and onward transmission of articles for the Field Force. _The Chin Expedition, Burma._