Uncle Percy with Mikhail Borodin, Stalin's advisor to the KMT Nationalist Party. Uncle Percy and father Jack accompanied Borodin to escape the KMT Nationalist's slaughter of left-wing elements, traveling by caravan across the Gobi Desert.

The incident is noted in the book “The Soogn Dynasty” by Sterling Seagrave, you can look under the names Eugene Chen (grand father), Jack Chen (father), Percy Chen (uncle), Si-lan Chen (aunt), Yolanda Chen and get a glimpse of what they were about … having a ball at a great adventure: