This pic commemorates a forgotten chapter in Sino-American relations, at least by most Americans, and that is our participation, alongside Great Britain, France, Germany, Austria-Hungary, Italy, Russia and Japan,, in the relief of the various foreign diplomatic legations besieged by Chinese Boxer rebels and Imperial troops in Beijing and Tianjing China during the Boxer Rebellion of 1900.On their way to the relief of these legations, however, members of the expeditionary corps, especially the Russians and Japanese, became notorious for their brutality and rapacity towards the Chinese civilian populations they met along the way.As for the troops depicted in the pic itself, they are US soldiers who made up a part of the Tianjing Expedition, taking a break from marching on the city.