Board Thread:Warhammer 40k General Discussion/@comment-6134883-20130417202949/@comment-3258762-20130426162119

Actually, through books which show them fighting (Legion of the Damned, for one), it is made clear that the Sisters are actually incredibly conservative and fanatic in their warfare. They stick to their original doctrine and rarely, if ever, divert from it, namely, as Chris said "Killing things with fire." which is usually actually kind of effective. They are more stubborn than the Imperial Guard and the Astartes, except possibly the Black Templars who are known for being the most stubborn there is