The Eight Hundred Heroes retreated from Sihang Warehouse and got in the foreign concessions, photo taken by Lyon. [Photo/ english.guardian.com]

However, Lyon had a wide range of contacts with Chinese rulers and concession authorities. He was the only one who got permission to take photos in the concessions, although he could not publish those pictures as he promised. This group of pictures is finally open now, which completes a piece of history that never comes easy.