To Win Without Fighting: The aim, at least, of most Imperial strategy (because the fighting is the costly part), and especially of eldraeic historic daehain, or “game war”, in which the generals on each side would maneuver until one side was placed in a strategically impossible position, and would then obligingly surrender on terms.  This was an extremely popular way of making war back in the day, since given the population demographics, etc., of a long-lived, low-population-growth species, it meant that you avoided destroying the assets – including the population – that you were fighting over.  Appallingly rational, really.