55 Days at Peking (1963)

 Trailer here

There is a lot of activity on the Boxer Rebellion wargames front. Crusader have started with Japanese and Boxers and Wargames Atlantic have plastics out. Check out North Star for more. There are also quite a few rules and books out too.

Here is the movie in full that probably started a lot of people off. Wiki

This historical epic dramatizes the Battle of Peking, a turning point of the Boxer Rebellion in China in 1900. When Dowager Empress Tzu-Hsi (Flora Robson) orders the Boxers, a group of Chinese secret societies, to massacre foreigners within China, a group of ambassadors, their families and staff hole up in a diplomatic compound. Major Matt Lewis of the United States Marine Corps (Charlton Heston) leads the defense while romancing Russian baroness Natalie Ivanoff (Ava Gardner).