This exciting action film offers a template for subsequent siege masterpieces, such as 'Rio Bravo' and 'Straw Dogs'. The narrative is beautifully simple and encapsulated in the title. In its steady focus on action, without reference to history, the film might seem to be ideologically free, abstracting the conflict (between colonists and Boxers) in the way Buster Keaton does in 'The General'. After all, its just one group attacking the other, we don't know the reasons or values of either's cause.
The film is in fact heavily weighted in a way subsequently influential on Hollywood cinema as a whole. Although it doesn't indulge in the 'Yellow Peril' racism that would mar Hollywood in the forthcoming decades, the title suggests a point of view, an attack on a mission, something violent and destructive on something stable and Christian. The fact that it's a 'Chinese' mission suggests that the Chinese aggressors are in some way attacking themselves. A fairer, if less crowd-pleasing, title might have been 'Justifiable Revolt against White Imperialists'.
Visually, the film bears this out. The missionaries are linked to the house, the solid, property, and to heterosexual normality (there are men and women); surrounded by trees and growth, they are natural, rooted, good bourgeois. The Boxers come from nowhere; they have no other purpose other than destruction; no family, religious or social ties; they hack down nature, or represent its more sinister manifestation, as their gun play creates gorgeous swirls of dust that obscure the peculiarly English country house.
Of course, there is an ambiguity here that the action cinema has never really resolved - the need to assert conservative values conflicting with the need for action, destruction, violence, above all, change. The film only becomes exciting when the Boxers charge in; and when one of the dear old ladies runs comically screaming to an upstairs balcony, you wonder which side the director is actually on.