Analysis of information sources in references of the Wikipedia article "Penor Rinpoche" in English language version.
QUOTE: "When Penor Rinpoche returned to Palyul late in 1956, the situation in Kham had become very tense. The lineages that had over thousands of years preserved the purity and authenticity of the Buddhist teachings were in danger of being broken and lost forever. Foreseeing this, and at the bidding of his protective deities, Penor Rinpoche fled with a party of three hundred towards the northeastern frontier of India. It was to prove a long and fearful journey, full of tragedy and immense hardship. In the end, only thirty survivors reached India."
QUOTE: "When Penor Rinpoche returned to Palyul late in 1956, the situation in Kham had become very tense. The lineages that had over thousands of years preserved the purity and authenticity of the Buddhist teachings were in danger of being broken and lost forever. Foreseeing this, and at the bidding of his protective deities, Penor Rinpoche fled with a party of three hundred towards the northeastern frontier of India. It was to prove a long and fearful journey, full of tragedy and immense hardship. In the end, only thirty survivors reached India."