February 1947 It is not entirely clear who the foreigners are. They are probably American military personnnel and journalists. Source
In the photo is Chinese poet Wang Yansheng. The photo was taken in Guiyang. For more on Wang Yansheng Source
For more see Source. This interview discusses a book on the only thirty women involved in the Long March.
Around 200,000 overseas Chinese left Vietnam fro China in 1979. They went to Guangxi, Guangdong, Fujian, Jiangxi, and Hainan to 196 work units. Source