From Eat the Buddha: Life and Death in a Tibetan Town, by Barbara Demick (Random House, 2020), Kindle pp. 22-23:
The Communists were ensconced 1,200 miles away at the borders of Jiangxi and Fujian provinces, where they had formed a mini–Soviet state. When Chiang’s forces launched an attack to dislodge them in 1934, the Communists broke into three armies and escaped in a retreat that would become known as the Long March. For the Chinese Communist Party, this is an epic event, enshrined in revolutionary ballads and operas—roughly the equivalent of the exodus out of Egypt, except it was not Moses but Mao leading the Red Army to safety.
With Chiang’s army in hot pursuit, the Communists fled farther and farther west into China before turning north in Sichuan province. For Tibetans, it marked their first encounter with the Chinese Communist Party. It did not go well.
The Red Army of the 1930s was not yet the formidable fighting machine that it would later become. The Chinese soldiers were short of equipment, food, and local knowledge. The last overlords of the plateau, the Qing, were Manchus, not Han; the envoys they sent to the plateau were usually Manchus or Mongols. Many of the maps and documents were in Manchurian. The Red Army soldiers were mostly Han from the lowlands of eastern and southern China.
Idyllic though Tibet looks in those coffee table books, the habitat is brutal to the uninitiated, the weather perilously unpredictable. You can be soaked through the skin one minute, charmed the next by a magnificent double rainbow, then shriveled by ultraviolet rays of the high-altitude sun. Hailstones big as chicken eggs can kill an adult yak and occasionally humans. The oxygen-starved atmosphere leaves newcomers faint and headachy. Even Tibetans get lost in swirling blizzards and die of exposure.
The Tibetan plateau was terra incognita for the Chinese. “Where are we? Have we left China?” one bewildered young soldier asked his commanding officer as they trekked through grasslands to the east of Ngaba, this according to a book by Sun Shuyun, The Long March: The True History of China’s Founding Myth. The commanding officer admitted that he didn’t know himself. He suggested they wait until they encountered somebody who spoke Chinese. They didn’t. The most pressing concern for the Red Army was a lack of food. The Chinese soldiers started by picking crops from Tibetan fields—some of them unripe—and stealing stockpiles of grain. They captured sheep and yaks for slaughter. Many young Communists were still idealistic about helping the poor, and the memoirs reflect that they sometimes left IOUs after they looted Tibetan larders. It didn’t do much good because there was a limit to how much food could be raised. The plateau couldn’t support a large population, certainly not the thousands of newly arrived soldiers. For the first time in living memory, Tibetans experienced famine conditions.
At some point, the Chinese discovered that the Buddhist monasteries contained not only the treasures of Tibetan civilization, but potential comestibles. Drums were made of animal hides that could be eaten if boiled long enough—a technique the soldiers knew because they’d already consumed their own belts, rifle straps, leather bags, and the reins of horses. They even ate figurines that had been sculpted out of barley flour and butter, according to a memoir discovered by scholars Jianglin Li and Matthew Akester, who have extensively researched this period.