I’ve just won a war in a low traffic system. While I certainly didn’t test the situation the result came my way purely through doing one low CZ every day and turning in the bonds on return. I stayed until each battle was won and then left (it’s all I have time for at the moment.) My bonds were very low, I don’t think I topped 1M - possibly, if memory serves, 600K credits at the top end. As I said, not properly tested…I expected to lose as I wasn’t able to play more than a few minutes each day.
I won 4-1 (although the information still says 3-1 despite system info saying I’m victorious and have taken control of the main station, which hasn’t passed over yet) and believe that the day I lost was due to a Cmdr coming in system and fighting in a CZ (probably Med or High, possibly multiple CZs but maybe just one - I don’t know if there’s a way you could tell?)
Traffic reports suggest very little traffic, a Krait and an Anaconda on the day I lost, the other days DBXs and Anacondas - I assume purely passing traffic. Inara suggest 0-5 ships per day.
If the system is really quiet enough it clearly takes very little effort to win, but can be easily overturned by someone competing against you.