As it was impossible to return to Europe during World War I, Alexandra David-Néel and Yongden left Sikkim for India and then Japan. There she met the philosopher Ekai Kawaguchi who had managed to stay for eighteen months in Lhasa as a Chinese monk in disguise a few years earlier. David-Néel and Yongden subsequently left for Korea and then Beijing, China. From there, they chose to cross China from east to west, accompanied by a colourful Tibetan Lama. Their journey took several years through the Gobi, Mongolia, before a break of three years (1918–1921) at Kumbum Monastery in Tibet, where David-Néel, helped by Yongden, translated the famous Prajnaparamita.