In the beginning of March, when the line was in its best working order, from 1,500 to 2,000 maunds were poured into Rungpo daily. Of these, only 400 or 500 maunds reached Phari; the rest was stored at Gantok or consumed on the road. Later, when the line was extended to Gyantse, not more than 100 maunds a day reached the front.
In the first advance on Gyantse, our column was practically launched into the unknown. As far as we knew, no local food or forage could be obtained. It was too early in the season for the spring pasturage. We could not live on the country. The ever-lengthening line of communication behind us was an artery, the severing of which would be fatal to our advance.
One can best realize the difficulties grappled with by imagining the extreme case of an army entering an entirely desert country. A mule, it must be remembered, can only carry its own food for ten days. That is to say, in a country where there is no grain or fodder, a convoy can make at the most nine marches. On the ninth day beasts and drivers will have consumed all the supplies taken with them. Supposing on the tenth day no supply-base has been reached, the convoy is stranded, and can neither advance nor retire. Nor must we forget that our imaginary convoy, which has perished in the desert, has contributed nothing to the advance of the army. Food and clothing for the troops, tents, bedding, guns, ammunition, field-hospital, treasury, still await transport at the base.
Fortunately, the country between our frontier and Lhasa is not all desert. Yet it is barren enough to make it a matter of wonder that, with such short preparation, we were able to push through troops to Gyantse in April, when there was no grazing on the road, and to arrive in Lhasa in August with a force of more than 4,000 fighting men and followers.
Before the second advance to Gyantse the spring crops had begun to appear. Without them we could not have advanced. All other local produce on the road was exhausted. That is to say, for 160 miles, with the important exception of wayside fodder, we subsisted entirely on our own supplies. The mules carried their own grain, and no more. Gyantse once reached, the Tibetan Government granaries and stores from the monasteries produced enough to carry us on. But besides the transport mules, there were 100 Maxim and battery mules, as well as some 200 mounted infantry ponies, and at least 100 officers' mounts, to be fed, and these carried nothing--contributed nothing to the stomach of the army.
