This article starts from the European misgivings, founded or not, about a foreign invasion. It underlines how this fear has always been present in the old continent and how it can be observed from a different point of view. In fact this short essay deals with the fear of “yellow people” in Europe between 1800 and 1900 and with the role played in influencing Europeans’ imaginary and fears by missionaries and war correspondents in the Far East. History that should be magistra vitae ends up being a lesson we never learn. The main events analyzed in this paper are the Boxer rebellion and the Russian-Japanese war.