Interstellar Warfare

Larry Niven's Man-Kzin Wars is a war series with an interstellar setting. Thus, at least two kinds of contributions to this series are possible:

cosmological speculations;
stories based on an understanding of military history.

Poul Anderson's contributions (see here) feature the kind of scientific extrapolation about cosmic conditions that Anderson displays in "Pride" and "Starfog" whereas Jerry Pournelle's & SM Stirling's first Man-Kzin Wars story begins with a former bureaucrat, now a general, who had taught military history before first contact with the kzinti. The ratcats are not used to encountering military resistance but are learning from it and one of their commanders has written two works on strategy.

Thus, we expect Pournelle and Stirling, both specialists in military fiction, to emphasize this aspect of the series. Their approach and Anderson's are complementary and should generate a better rounded series than any single author would have been able to write.