[kazen44]

Also, i think one also has to look at historical relevance and technology.

Fighting battles on the eastern front in WW2 is significantly different then warfare during ancient times or even the 18th century. For one, warfare is far more deterimental to the rest of society, and fighting effectively requires a lot more effort in the modern world compared to early times in terms of logistics, production, technology and strategy. Also, "warfare performance" is very much influenced by the enviroment one fights. How does one measure who is a better general when one, for instance, is severely undersupplied or in complete foreign terrain? there are simply too many variables to take into account to do suchs a study across suchs an incredibly large timeline.