Re: Relativistic Effects of Interstellar War
It may be, but the point is that one doesn't have to take every star system between here and there due to just how empty most of space is. Think similar to the Pacific Campaign of WWII where they would take some islands and skip around others and even hit Japan itself (Dolittle Raid) just to show them they were vulnerable.
Heck, if you're already able to conduct an interstellar war (even with relativistic effects) then the easiest way to win if you don't care about taking a planet with its resources (people, buildings, etc...) intact would just to be to launch ships that release nice chunks of mass without slowing down as they go from star system to star system. If they could detect the masses, they would have only hours to react to defeat them at 50% of Lightspeed (11 hours from Pluto orbit to the Sun). Just keep sending ships to do that from various directions. Only have to get lucky a few times to decimate a planetary body.