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.
How were these beasts to be fed, and how was the whole apparatus of an army to be carried along, when every additional transport animal was a tax on the resources of the transport? There were two possible solutions, each at first sight equally absurd and impracticable:—wheeled transport in Tibet, or animals that did not require feeding. The Supply and Transport men were resourceful and fortunate enough to provide both. It was due to the light ekka and that providentially ascetic beast, the yak, that we were able to reach Lhasa.
The ekkas were constructed in the plains, and carried by coolies from the cart-road at Rungpo eighty miles over the snow passes to Kamparab on the Phari Plain. The carrying capacity of these light carts is 400 pounds, two and a half times that of a mule, and there is only one mouth to feed. They were the first vehicles ever seen in Tibet, and they saved the situation.
The ekkas worked over the Phari and Tuna plains, and down the Nyang Chu Valley as far as Kangma. They were supplemented by the yaks.
The yak is the most extraordinary animal Nature has provided the transport officer in his need. He carries 160 pounds, and consumes nothing. He subsists solely on stray blades of grass, tamarisk, and tufts of lichen, that he picks up on the road. He moves slowly, and wears a look of ineffable resignation. He is the most melancholy disillusioned beast I have seen, and dies on the slightest provocation. The red and white tassels and favours of cowrie-shells the Tibetans hang about his neck are as incongruous on the poor beast as gauds and frippery on the heroine of a tragedy.